Jun 7, 2023

8 Best LSI Keyword Research Tools to Increase SERP Ranking

Suman Samal, Asst. Marketing Manager
Suman Samal
8 Best LSI Keyword Research Tools to Increase SERP Ranking
Suman Samal, Asst. Marketing Manager
Suman Samal
Jun 7, 2023

8 Best LSI Keyword Research Tools to Increase SERP Ranking

Discover the 8 best LSI keyword generator tools to boost your SERP ranking. Know how to improve your SEO strategy and drive more organic traffic.
8 Best LSI Keyword Research Tools to Increase SERP Ranking

Table of contents

In this blog, we will explore what LSI keywords are, the benefits of using LSI keywords, and the best LSI practices employed by businesses to improve their website traffic. We will also delve into the best LSI keyword research tools that can assist you in optimizing your content and boosting your SERP ranking.

What is Latent Semantic Indexing?

Latent Semantic Indexing (LSI) is a technique used by search engines to analyze and understand the relationships between words and phrases in a piece of content. It helps search engines determine the context and relevance of a webpage by identifying related keywords and concepts. Incorporating LSI keywords into your content can enhance its semantic richness and improve your search engine rankings.

What are LSI Keywords?

LSI (Latent Semantic Indexing) keywords, also known as semantic keywords, are terms that are semantically related to a main keyword or topic. These keywords are not simply synonyms but words or phrases with a strong contextual relationship with the main keyword. Search engines use LSI keywords to understand the content's context and relevance, helping to provide more accurate search results.

8 Best Free LSI Keyword Research Tools

The following are the 8 best free LSI keyword research tools that businesses have popularly used to generate relevant keywords for their content. 

#1. Scalenut - All-in-one SEO Tool 

Scalenut is an AI-powered SEO and content marketing platform that offers a powerful LSI keyword research tool called Keyword Planner as part of its comprehensive SEO toolkit. The LSI keyword finder provided by Scalenut is designed to help content creators and marketers discover relevant and semantically related keywords to optimize their content for better search engine visibility. 

By incorporating these LSI keywords into their content, users can enhance the contextual relevance and improve the overall SEO performance of their articles, blog posts, or website pages.

Benefits of using Keyword Planner LSI Keyword Research Tool by Scalenut 

In-Depth Insights: 

Scalenut’s Keyword Planner tool provides valuable insights into each LSI keyword, such as keywords frequency, importance, headings volume, and the sites that have covered the topics related to your desired keyword.

Scalenut's LSI keyword research tool is a time-saving solution for effectively finding and leveraging LSI keywords. For instance, in the above example, we wanted relevant semantic keywords for the primary keyword, keto diet. Scalenut’s keyword planner gave a comprehensive list of semantic keywords such as calories, carb, weight loss, whole grains, nutrition, etc., with its search volume, competition, importance, etc.  This data empowers content creators to make informed decisions about which LSI keywords to prioritize and integrate into their content to maximize organic traffic and visibility. 

Competition Overview

You are offered an overview of the best 30 competition sites that have written articles on your desired keyword. You get to see their Page Statistics, such as word count, SEO score, H tags, Images, metric trends, etc., all in one place. 

Content Outline of  Top Websites: 

Scalenut AI-powered outline builder presents content outline and competitor content analysis. 

You can also check the content outline of the topic covered by other websites. For instance, you can check what sub-topics are covered or what H2 and H3 tags they have used, etc. 

Top Questions Across Channels

You can check what people are asking across the internet. This can help you create relevant content for your audience. 

  • Statistics from Top-ranking Articles: You can verify statistics from other top sites on a similar topic. There is also a search feature that helps you search for relevant statistics.
  • Citations: Additionally, you gain access to citation links that have been extensively utilized by numerous websites, providing data on the frequency of their usage.


  • Offers an extensive insight into your desired keyword
  • Automatically generates keyword clusters 
  • Offers SERP Analysis
  • Offers SERP Statistics and sources relevant key phrases from platforms like Quora, Reddit, People Also Ask, etc., 
  • Provides automated content outlines for your desired word
  • Has a social listening feature to keep you updated on what people are talking about your desired keyword
  • Scalenut offers a 7-day free trial to try the tool extensively.


  • Scalenut may have a slightly steep learning curve; however, it provides a dedicated help center with comprehensive documentation and video tutorials to assist you in quickly overcoming any challenges and reducing the learning curve.

Plans and Pricing

Scalenut Price

  • Essential Plan: This plan caters to the needs of solopreneurs and freelancers looking for robust content creation tools. With this plan, you get access to five SEO reports and up to 100,000 AI-generated words every month, all starting at just $19/month, paid annually. 
  • Small Business Growth Plan: This plan is custom-made for startups and small businesses that want to elevate their content game. You get unlimited AI-generated words, 30 SEO reports, and advanced features like Instruct AI to Write and Topic Clusters, all starting at $39/month, paid annually. 
  • Pro Plan for Large Teams: The Pro Plan provides top-quality content at scale for established businesses and large teams. This plan comes with all the features of the Growth Plan, a dedicated customer success manager, and multi-user support, priced at $74/month paid annually. 

Also Read: 

15 Best Keyword Research Tools Every Marketer Should Know In 2023

9 Best AI SEO Tools in 2024 | Scalenut

7 Best SEO Competition Research Tools to Outrank Your Competitors

#2. Google Keyword Planner

 Google keyword planner

Google Keyword Planner is a free LSI keyword tool provided by Google Ads. It allows you to search for keywords and provides data on their search volume, competition, and suggested bids. By exploring the "Keyword Ideas" section, you can find related keywords and variations semantically linked to your primary keyword.‍ Google Keyword Planner is a free LSI keyword tool provided by Google Ads. 


  • Reliable data source
  • Comprehensive keyword suggestions
  • Integration with other Google tools


  •  Limited access without a Google Ads account
  • Focus on paid search
  • Lack of specific search volume data


  • Free

( Note: To access and use it, you must have a Google Ads account. Creating a Google Ads account is free, but remember that the tool is primarily designed for Google Ads advertisers.)

#3. Google Autocomplete

Google Autocomplete

Google's instant search feature suggests related keywords when you type in your main keyword. Look for the bolded suggestions and incorporate relevant ones into your content.


  • Suggests LSI (Latent Semantic Indexing) keywords in real-time as you type
  • Auto complete feature is based on user behavior and popular search queries, ensuring that the suggested LSI keywords are relevant and aligned with user intent.
  • Autocomplete LSI keywords can help you discover related terms and variations you might not have considered.


  • Provides generic suggestions based on popular queries
  • Google's algorithms generate suggestions, and you have limited control over the suggested LSI keywords. This can be restrictive if you have specific keyword requirements.
  • Tends to favor popular search terms, which might not always reflect the most relevant or niche-specific keywords for your content.
  • Autocomplete suggestions are generated based on partial phrases, which means they may lack context.


  • Free Tool

#4. Google Related Searches

Google Related Searches 

Google’s Related Search features offer additional keyword search results apart from what you find through an instant search feature. You just have to enter your main keyword into Google and scroll down to the "Related Searches" section at the bottom of the page to find more listed terms related to your primary keyword. 


  • Provides additional relevant search suggestions
  • Helps users discover related topics or queries
  • Saves time by offering alternative search options
  • Expands search possibilities beyond the original query
  • Assists in finding more specific or detailed information


  • May distract users from their original search intent
  • Can lead to information overload or excessive browsing
  • Sometimes provides unrelated or irrelevant suggestions
  • Privacy concerns regarding data collection for personalized recommendations
  • Users may rely too heavily on related searches, limiting exploration


  • Free Tool 

#5. People Also Ask

Google People Also Ask 

The "People Also Ask" (PAA) box on Google's search results page is another valuable resource. It provides additional options for LSI keywords. The questions listed in the PAA box often include variations or related queries related to the original search term, helping users discover additional keywords and expand their understanding of the topic.


  • Increased user engagement
  • Provides additional relevant information
  • Enhances search experience
  • Helps users discover related topics
  • Improves organic search visibility


  • May distract users from the main content
  • Can lead to information overload
  • May display inaccurate or irrelevant information


Free Tool

#6. LSI Graph

 LSI Graph home page featuring its tool

LSI Graph is a free LSI Keyword Generator that lets you discover all the terms related to your primary keyword. You just have to enter your main keyword, and you will receive a list of related LSI terms. 


  • Provides relevant keyword suggestions for content optimization
  • Helps in identifying related keywords and concepts
  • Assists in expanding keyword lists for better SEO performance
  • Improves content discoverability by targeting specific keyword variations
  • Saves time and effort in manual keyword research


  • May generate irrelevant or inaccurate keywords at times
  • Relies on statistical analysis and may miss certain nuances or context
  • Limited to the existing corpus of data used for training
  • Lacks real-time keyword trends or changes in search behavior
  • Requires manual filtering and evaluation of generated keywords


  • One-month plan: $43.99
  • 36-month plan: $149.99/mo
  • 12-month plan: $24.92/mo

#7. Serpstat

Serpstat home page featuring its tool

Serpstat is an effective tool for finding semantically related phrases for your articles. You just have to enter your main keyword and navigate to SEO Research > Related Keywords. You'll be presented with a lengthy list of words and phrases.


  • Offers an intuitive dashboard 
  • Provides relevant keyword suggestions for content optimization.
  • Offers extensive keyword data in the free version


  • Paid version is expensive 
  • Keyword research could be better


  • Lite: $55/mo
  • Standard: $119/mo
  • Advanced: $229/mo
  • Enterprise: $399/mo

#8. Keyword Magic Tool by Semrush

 SE Ranking Alternative Semrush home page featuring its tool

Semrush is a comprehensive SEO toolkit that offers a variety of keyword research features. It provides data on keyword volume, competition, and related keywords. Semrush's "Keyword Magic Tool" is particularly useful for generating LSI keyword ideas. It suggests semantically related keywords, long-tail variations, and provides search volume and keyword difficulty metrics.


  • Provides a comprehensive range of similar and related keywords, along with key metrics such as Volume, Trend, Keyword Difficulty, Intent, and more.
  • Offers flexibility to filter the keyword results based on any metric you prefer.


  • Primarily focuses on providing data for Google, which means it may not offer metrics for other popular search engines such as Bing, DuckDuckGo, or YouTube. This can be a limitation for users seeking comprehensive data across multiple search platforms.


  • Pro: $119.95/mo
  • Guru: $229.95/mo 
  • Business: $449.95/mo

Are LSI Keywords Equivalent to Synonyms?

LSI (Latent Semantic Indexing) keywords and synonyms are related but different. Let’s understand with an example:

Let's say you're writing an article about "healthy eating." Synonyms for "healthy eating" could include phrases like "nutritious diet" or "clean eating." These are words or phrases that have similar meanings to the main keyword.

On the other hand, LSI keywords for "healthy eating" could include terms like "balanced nutrition," "whole food," "nutrient-rich meals," or "optimal dietary choices." These LSI keywords are not just synonyms but related concepts that are semantically connected to "healthy eating."

LSI keywords help search engines understand the broader context and content of a page beyond just the primary keyword. By incorporating LSI keywords into your content, you provide additional signals to search engines about the relevance and depth of your topic, which can help improve your search rankings.

So, while synonyms can be part of LSI keywords, LSI keywords go beyond simple word similarity and encompass a range of related terms and concepts that contribute to a more comprehensive understanding of a topic.

Does Google use LSI keywords?

Google's algorithms have evolved over time to incorporate semantic understanding and provide more relevant search results. While Google has not explicitly confirmed the use of latent semantic indexing (LSI) keywords in their algorithms, they employ various techniques to understand the context and meaning of web content. Here are a few ways in which Google employs semantic analysis:

  • Latent Semantic Indexing (LSI) Variation

Latent Semantic Indexing (LSI) Variation refers to the different approaches, methods, and techniques employed within the framework of Latent Semantic Indexing. LSI is a mathematical model used to analyze the relationship between terms and documents in a collection of text. It is particularly useful in information retrieval and natural language processing tasks.

  • RankBrain

RankBrain is a machine learning algorithm used by Google to process search queries and improve search results. It incorporates natural language processing and semantic analysis techniques to understand the intent behind a query and provide relevant results, even for complex or ambiguous queries.

  • Contextual Understanding

Google aims to understand the context of a search query by considering various factors, such as the user's location, search history, and other contextual signals. This helps Google provide more personalized and contextually relevant search results.

  • Semantic Search

Google has been moving towards semantic search, which focuses on understanding the intent and meaning behind a query rather than just matching keywords. This involves analyzing the relationships between words, identifying entities, and recognizing concepts to deliver more accurate search results.

What Are Some of the Best LSI Practices to Improve Your Website Ranking?

You can enhance your website ranking by implementing the following proven LSI practices:

  • Understand LSI

LSI is based on the concept of identifying latent (hidden) relationships between words and documents. It aims to determine the contextual meaning of words by analyzing their relationships with other words in a given corpus. LSI can help search engines understand the content of a page more accurately and provide better search results.

  • Perform LSI Keyword Research

Start by conducting LSI keyword research related to your target topic or keyword. Identify keywords and phrases that are semantically related to your main keyword. You can use various tools like Scalenut keyword planner, Google Keyword Planner, etc., to find relevant LSI keywords.

  • Incorporate LSI Keywords Naturally

Once you have a list of LSI keywords, incorporate them naturally into your content. Avoid overstuffing your content with keywords, which may negatively impact your ranking. Instead, focus on creating high-quality, valuable content that incorporates the LSI keywords naturally and seamlessly.

  • Create Comprehensive Content

LSI works best when the content is comprehensive and covers various aspects related to the topic. Instead of focusing solely on your main keyword, ensure that your content addresses a broader range of related concepts and ideas. This approach helps search engines recognize the relevance and depth of your content, potentially improving its ranking.

  • Optimize On-page Elements

Besides the content itself, optimize other on-page elements for LSI. This includes meta tags, headings, image alt tags, and internal linking. Incorporate LSI keywords into these elements, where appropriate, to provide further context to search engines.

  • Promote Your Content

While LSI primarily focuses on on-page optimization, it's essential to promote your content to gain backlinks from authoritative sources. Backlinks from reputable websites can increase the visibility and ranking of your content. Aim to build natural and relevant backlinks that demonstrate the quality and relevance of your content.

  • Monitor and Analyze Results

Regularly monitor your search rankings and traffic to evaluate the impact of LSI optimization on your content's performance. Analyze the data and identify areas for improvement. Adjust your strategy and continue optimizing your content based on the insights gained.

What Are the Benefits of Using LSI Keywords in SEO?

Using LSI keywords in SEO (Search Engine Optimization) offers several benefits that can help improve the visibility and ranking of your website. Here are some key advantages:

  • Improved Content Relevance

LSI keywords help search engines understand the context and relevance of your content. By including related keywords and phrases that are semantically connected to your target keyword, you provide a more comprehensive picture of your content's topic. This helps search engines match your content with relevant search queries, leading to improved rankings.

  • Enhanced User Experience

LSI keywords allow you to create more valuable and informative content for users. By incorporating related terms and concepts, you provide a deeper understanding of the topic, addressing various aspects that users may be interested in. This improves the overall user experience and encourages longer engagement on your website.

  • Avoidance of Keyword Stuffing

Keyword stuffing is a practice that search engines penalize as it degrades the quality of content and user experience. LSI keywords offer an alternative to repetitive and excessive use of the same target keyword. By diversifying your content with LSI keywords, you can maintain a natural flow of language and avoid over-optimization.

  • Higher Search Engine Rankings

When search engines identify the relevance and quality of your content through the use of LSI keywords, they may reward your website with higher rankings in search results. Demonstrating a comprehensive understanding of the topic and providing valuable information makes your content more likely to be considered authoritative and deserving of a higher position in search listings.

  • Increased Organic Traffic

By optimizing your content with LSI keywords, you have the potential to attract more organic traffic to your website. As search engines better understand your content's relevance and match it with relevant search queries, your website becomes more visible to users searching for related topics. This increased visibility can lead to higher click-through rates and a greater influx of organic traffic.

How to Find LSI Keywords for Your Niche?

To find relevant LSI keywords for your niche, you must bear the following points in mind: 

  • Identify Your Primary Keyword

Start by determining the main keyword or topic that represents your niche. This is the core term you want your content to rank for.

  • Conduct Keyword Research

Use keyword research tools like Google Keyword Planner, Semrush, or Ahrefs to explore related keywords and phrases. Look for terms that are semantically similar to your primary keyword.

  • Analyze Search Engine Suggestions

When you enter your primary keyword into search engines like Google, take note of the suggested search queries that appear below the search bar. These suggestions often include LSI keywords.

  • Review Search Engine Results

Examine the top search results for your primary keyword. Pay attention to the keywords and phrases used in the titles, headings, and content of these pages. These terms can give you insights into relevant LSI keywords.

  • Utilize LSI Keyword Tools

Several online tools specifically focus on generating LSI keywords. Tools like LSIGraph, LSIKeywords.com, and Keyword Tool can assist in generating a list of LSI keywords based on your primary keyword.

  • Explore Related Searches

At the bottom of Google's search results page, you'll find a section called "Searches related to [your keyword]." These related searches can provide additional LSI keyword ideas.

  • Analyze Competitor Content

Study the content produced by your competitors within your niche. Look for recurring themes, phrases, and keywords they use. These can serve as potential LSI keywords for your content.

  • Use Semantic Analysis Tools

Tools like TextRazor, MonkeyLearn, or Word2Vec can help analyze the semantic relationships between words and suggest related terms and concepts.

  • Leverage Google Trends

Google Trends allows you to explore the popularity and related terms associated with your primary keyword. This can uncover LSI keywords that are currently trending or gaining interest.‍‍

     10. Incorporate User-generated Content

Engage with your audience through forums, social media groups, and comment sections to identify commonly used words and phrases related to your niche. These user-generated keywords can be valuable LSI keywords.


To improve your website's ranking using LSI keywords, it is important to understand LSI and perform LSI keyword research. Tools like Scalenut's Keyword Planner, Google Keyword Planner, and other online tools can assist in finding relevant LSI keywords for your content. By incorporating LSI keywords effectively into your content, you can improve your SEO strategy, drive more organic traffic, and boost your SERP ranking. So, sign up for Scalenut’s 7-day free trial today to optimize your content and improve your website ranking!

About Scalenut 

Scalenut is an AI-powered SEO and content marketing platform that helps discover and create relevant content for your customers. Be it brainstorming a content strategy, creating comprehensive briefs, generating the content, or optimizing it per the best SEO practices, Scalenut has made the process extremely easy. Click here to create a free account and explore the many features of this tool
When it comes to increasing your website's visibility, ranking high on search engine results pages (SERPs) is key. One way to improve your SERP ranking is by incorporating latent semantic indexing (LSI) keywords into your content. These keywords are related to your content's main keyword or topic and help search engines understand your content. 

Suman Samal
Asst. Marketing Manager
ABout the AUTHOR
Suman Samal
Asst. Marketing Manager

Suman Samal is a Asst. Marketing Manager at Scalenut. She is a technology enthusiast with a keen interest in content marketing and SEO. She truly believes that with the right set of tools every organization can improve the ROI of their content marketing campaigns. She spends her time managing content operations at Scalenut and ensuring that everything we publish is of the highest quality.

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