Oct 6, 2021

The Comprehensive Guide To LSI keywords: Are They Important in SEO?

Suman Samal, Asst. Marketing Manager
Suman Samal
The Comprehensive Guide To LSI keywords: Are They Important in SEO?
Suman Samal, Asst. Marketing Manager
Suman Samal
Oct 6, 2021

The Comprehensive Guide To LSI keywords: Are They Important in SEO?

Do you know that LSI keywords are one of the most important part of your SEO strategy? Here is a guide to explain what LSI keywords are and how to use them for better ranking.
The Comprehensive Guide To LSI keywords: Are They Important in SEO?

Table of contents

Do you know that around 15% of the search queries on Google are the search terms that are new or less used?

Similarly, there are billions of such search terms on the Internet.

Googlers use different and various approaches to search for a specific term. For this reason, LSI keywords have become the buzzword among SEOs.

So, does this statement hold true, or is it just another myth in SEO?

This article will give you detailed information on the LSI keywords and how to use them to appear in the Google search results.

The truth is Google is becoming more and more powerful. It's getting harder to get your content noticed.

If you want to rank for the right keywords, you need a plan that works in conjunction with Google's algorithm updates.

It is hard to rank for a single target keyword in your content. Furthermore, Google considers keyword stuffing as a black hat method.

So, how do you target a keyword that is hard to rank?

Possibly, LSI keywords are the answer.

What is Latent Semantic Indexing and does it matter to SEO & RankBrain?

Latent semantic indexing (also called Latent Semantic Analysis) is a process of analyzing the set of documents to identify the hidden meanings of words. It is old technology now that started at the time of the evolution of the internet.

In terms of SEO (search engine optimization) and SEO community, LSI keywords are the terms that are related to the main terms you want to rank for.

They are closely related, but not exactly the same as your keyword target.

They are the conceptually related terms that search engines use to understand the content on the webpage. When you use them, you are basically telling Google RankBrain what your content is about.

The theory behind the LSI method is that a piece of content should have certain words, phrases, or even entire sentences which can be used by Google to understand its relevance.

In the usage of these keywords, Google knows what you're talking about because it can relate them to other pages in its index.

Let us take an example of the LSI keywords. If your blog post is about fashion, the LSI keywords must be shoes, fashion designer, jewellery, etc.

In the same way that Google understands your content from a semantics perspective, it also uses these words to understand what is being talked about in your article.

These terms also act as an index for similar terms.

These words are used to help Google understand the topics that you're talking about and determine what other pages on the internet talk about the same queries.

What are Polysemic words?

Polysemic words and phrases are those with multiple different meanings. This basically means that they can easily be changed to refer to different things.

This is one of the main advantages of using polysemic words; it helps increase re-marketing options for your product or service, as well as create greater search possibilities simply by creating a wordplay possible query input.

Why LSI keywords are crucial to SEO and Content Marketers?

In early SEO days, Google used to rely on a single keyword to understand the content piece. Marketers used to scatter the target keywords around the content and in the headers, meta descriptions.

So, if a page is about the 'natural processing'; Google would only understand the content if it has the term natural processing in it.

However, SEO has become tougher and Google has become even smarter. It uses the LSI keywords to understand the content at a deeper level.

With the emergence of content marketing, it is more crucial than ever for marketers to use them in their content marketing strategies.

Nowadays, Google uses these keywords to understand the context of the content piece. When you use them, it helps your SEO to identify what kind of information your target audience is looking for on the internet.

Let's say the main keyword is around the 'chicken broth'. Now, Google will look for the main keyword in the heading, meta, and image alt text.

However, it will also use the LSI keywords in the content to understand what is being talked about. So, if you are talking about 'chicken broth' in your article, Google will look for the LSI keyword like chicken, soup, broth, and other relevant terms.

In the next section, we have further shared what LSI terms to use in the content and how does it work?

Which LSI keywords to use to enhance ranking?

LSI keywords are the most important aspect of content marketing. They are also used to understand the context of your target audience.

There is a wide range of LSI keywords that you can use in your content, depending on what kind of information you want to deliver.

Below is an example of how to use the these keywords throughout your content to create relevancy in the content:

Heading: You can use the LSI keywords in the H1 tag of your web page. For example, the main keyword 'chicken broth' can be used in the headings like "Chicken Broth Recipe", "How to Make Chicken Broth" and so on.

Image Alt Text: Image alt text is one of the best ways to use LSI keywords and appear in related searches. For example, if you are talking about 'chicken broth', Google will look for LSI keywords like chicken, soup, broth, and other relevant terms in your image alt text.

Content: The content of your article is very important because it will show the LSI keywords that you have used in your content. You can also add other relevant keywords to your content. For example, "Chicken Broth Recipe" can be added as a keyword for the 'chicken broth' article while adding other related terms like "Homemade Chicken Broth" and "Chicken Broth Recipe".

All of the above LSI keywords are very important for a successful content marketing strategy.

Now, there are few ways to generate them for your main topic. Most of the SEOs rely on Google autocomplete to instantly find the closely related words.

The next section talks about the working of LSI keywords.

How does LSI work?

LSI works by using the complex mathematical formula that establishes the relationship between the words and phrases used in other same content on the Internet.

The computer scans through the documents about a topic to find patterns and relationships and create words beyond exact match queries.

This helps them deliver more relevant search results.

Does Google use LSI for optimization?

Now, it is still unclear if Google uses LSI or not. We all have seen that Google goes beyond the exact match and tries to give a better result for the users.

Most of these keywords work on either synonymy or polysemy words.

However, Google's representatives such as Bill Slawski and John Mueller have constantly disregarded the use of LSI keywords by the search engine.

Are LSI keywords the same as synonyms?

Some LSI keywords might be synonyms but not all the synonyms are LSI.

LSI keywords are words or phrases that search engines like Google see as being semantically (or conceptually) related. It is not the same as the synonyms. However, search engines use synonyms to return the best results.

These are the terms that are tied to your keywords closely whereas synonyms are just another word with the same meaning.

For example, A synonym of the word fall could be the season (autumn) or the act of falling. This makes it hard to understand the context. But, when we use semantically related words, the context becomes relatable and easier to understand.

Benefits of using LSI keywords

LSI keywords can have various benefits if used well in the content.

They have a greater chance of being picked up by the search engines when they are searched for in a question or answer.

When they are used in a question, it is more likely that the person asking the question will also use them in the answer.

Here are some of the benefits of using LSI keywords:

1. It is highly effective in increasing the search engine ranking.

2. It is a cost-effective way to boost your website's visibility and authority.

3. It can be used as an effective tool for improving the performance of a website by decreasing bounce rates, increasing conversion rates, and enhancing brand awareness.

4. It helps you gain more traffic from search engines by improving your website's ranking on their SERPs.

What is the difference between LSI and TF-IDF?

LSI and TF-IDF are both algorithms that help find terms and phrases relevant to the document you're looking at. TF-IDF is a machine learning algorithm used to find merely significant and important words in the text.

LSI is based on finding clusters of words related to your target keyword by using latent semantic analysis (lsa) and TF-IDF is based on finding terms related to the keywords while weeding out more common terms.

In one way or another, they may have the same meaning but have different core algorithms. People often confuse LSI keywords and longtail keywords as well. Read our comparison on LSI vs Longtail keywords to understand the difference.

When did LSI become relevant?

LSI became relevant in 2004 when Google incorporated latent semantic indexing in its algorithms. Before that, it was not important.

The main purpose of LSI was to suggest relevant results from their database even when no one has searched for those terms before. The end goal is to provide the searchers with the most relevant results.

To understand the deeper context of the content, Google changed its algorithm from focusing on a single keyword to rather focusing on the anchor texts and the sites that link to the content.

This way, Google understood the synonym and context of the page. Instead of looking at the single keyword, the search engine focused more on the context now.

Which tool is best for LSI keywords?

When it comes to finding the best tool for generating LSI keywords, there are many options available. Ultimately, the best tool depends on the specific needs and preferences of the user. It is important to experiment with different tools and find the one that works best for your individual needs.

Here are some best practices and tools to find the LSI keyword suggestions:


Many SEO experts use SERP tools (Search Engine Results Page) that can generate ideas for LSI keywords based on a particular topic or keyword. These tools analyze the top-ranking pages for the given keyword and suggest related terms that are commonly used in those pages.

Google Autocomplete

This is the simplest way to find the LSI keywords for any main keyword. These are the keywords that appear in the search bar.

All you need to do is type your target keyword into Google’s search and look at the autocomplete results and suggestions it gives.

Find the words that are in bold and incorporate them into your content.

Google Related Searches

You can use the Google-related search section. It gives you suggestions related to your seed keyword. These are the words that people searching for your seed keywords may get results for.

Simply type the main keyword and search. Scroll down to the bottom of the page to find the related searches in the "Related searches" section.

Here is an example of the main keyword 'shoes' and their related searches.

Use the most relevant ones within your content.

People Also Ask

PAA section can be a great free source to find LSI keywords. You can simply type your main keyword and scroll down to find the related questions.

PAA section will give you keyword ideas about the related words from the questions and answers. Notice the keywords that are marked in bold.

For example, the seed keyword autumn gives various questions for LSI keywords.


It is a free LSI Keyword Generator and best keyword research tool for these keywords that help you quickly find all the terms related to your main keyword.

Simply type in your main keyword in the box and search to find the list of LSI keywords. This tool finds the them on the basis of relevancy and search volume.

You can use LSIgraph paid version to find all the keywords.

Google keyword planner

Google Keyword Planner is another great LSI keyword tool. It allows you to create a list of keywords that are likely to get more searches.

The tool allows you to put in the most important keywords and it will give you a list of related keywords.

You can create long-tail keyword lists which target specific audiences, industries, and countries for your website's searches and Advertising campaigns.


The SEMrush tool is an invaluable resource for uncovering LSI keywords. This tool is particularly helpful for content creators who want to ensure that their content is well optimized for both search engines and the human audience who will be reading and engaging with their content.


Keywords are the most important part of SEO. We all know that, but we do not use them as often as we should.

Linguistic Semantic Indexing is a great way to help improve your site's search engine rankings and boost your page SEO.

In a nutshell, this is a very effective technique that can be used to improve your search engine rankings by having relevant content on your website.

It is also an effective SEO strategy for link building since you will be able to get links from other websites with varied anchor text.

We hope this article has helped you get a better understanding of LSI keywords and how to use them.

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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