LSI Keywords: The Future of Semantic Search and SEO?

Tobit Odili

Tobit Odili

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Are you tired of being buried in the depths of search engine rankings? It’s time to harness the power of LSI (Latent Semantic Indexing) keywords and give your website the boost it needs. These closely related keywords are the future of SEO.

They can help search engines understand the context of your content better, ultimately improving your website’s visibility and driving more traffic. In this post, we’ll dive into the importance of LSI keywords and show you how to use them to rise above the competition in search engine rankings.

Whether you’re a seasoned SEO expert or just starting, LSI keywords are crucial to help you get the results you’re after.

What Are LSI Keywords?

Latent Semantic Indexing (LSI) keywords are phrases or words that are semantically related to the main keyword of a piece of content. In other words, they are terms that search engines expect to see in content relevant to a particular topic.

For example, if you’re writing a blog post about “digital marketing,” some LSI keywords could be “SEO,” “content marketing,” “social media marketing,” and “pay-per-click advertising.”

Incorporating LSI keywords into your content can help search engines understand the context of your content better, improve the relevance and quality of search results, and ultimately enhance the user experience. LSI keywords are an essential component of modern SEO, and using them effectively can give your website a significant advantage in search engine rankings.

What Is Latent Semantic Indexing?

Latent Semantic Analysis, or LSI, is a Natural Language Processing (NLP) method created in the 1980s to determine the contextual connection between words.

To enhance information understanding, Latent Semantic Indexing “finds the hidden (latent) relationship between words (semantics).” Based on the language used, understanding the content of a page can assist in identifying the subject.

Theoretically, it makes sense for Google to use this method to comprehend words in particular. Using these in a piece of content would aid the search engine in better understanding the subject.

As there is no proof that Google uses Latent Semantic Indexing for this purpose, the debate over the use of the term “LSI keywords” is more focused on the lack of evidence than on the significance of writing content that discusses the topics you’d expect to see on a page about any given subject.

Since it was created for smaller document sets rather than the entire web, LSI is an outdated technology.

Nevertheless, semantics is crucial to how search engines interpret a page of information. There is no disputing that synonyms and words with similar semantic meanings are necessary when writing in-depth about a subject.

Benefits of Using LSI Keywords

Benefits of Using LSI Keywords - iRocket VC

The contextual relevance of your material is increased, and there are SEO advantages to using LSI keywords:

Increased Search Engine Rankings

A search engine aims to provide users with useful and relevant information. Your material will be more valuable and relevant thanks to LSI keywords. Therefore, regardless of your goal keyword, your search engine rankings will rise for semantically related searches.

Increased Credibility of the Information

Many people are likely to study and spread the content because it is current and relevant. Its trustworthiness will, therefore, only grow over time. It will help your content stick out from the competition, particularly the generic content that makes up most of the web.

Enhanced On-Site Viewing Speed

Better material encourages visitors to stay on your website longer. They might even click on some of your website’s other connections. Thanks to the varied use of LSI keywords, a casual and conversational tone is essential for keeping your target audience glued to the screen.

Lower Redirect Rates

The content that LSI generates is very specialized. It consistently gets the appropriate audience. Better involvement ultimately results in a lower bounce rate. All of these advantages eventually result in improved SEO and user experience.

LSI Indexing Method Limitations

  • It eliminates all conjunctions and prepositions and doesn’t consider word sequence.
  • It believes that each word has only one significance.

Are LSI Keywords the Same as Synonyms?

The distinction between LSI terms and synonyms must be made.

A word with the same meaning as another and can be used in its stead is a synonym. However, some words are contextless when used alone.

The term “fall” illustrates a synonym taken out of context. This could refer to either the time of year (autumn) or the actual process of falling. It can be challenging to determine the context of a phrase on its own.

However, it makes sense when you add words to a page of material that is semantically related.

When words on the page refer to objects like leaves, trees, and weather, the word “fall,” which is used in the context of a season, makes sense. These are related terms that suggest the meaning rather than being synonyms. In many instances, related words could assist in defining a topic without even mentioning it.

There is no ambiguity surrounding the subject or the definition of the term when talking about gas about content about cars, miles, or roads.

From the viewpoint of search engine optimization, this implies that search engines understand the words they expect to see on a page that discusses a particular subject and the significance of using these in your content.

If you don’t mention the things that the other pages do, how can you expect Google to rank your content as the most relevant website on the web for a query? You need to be using semantically related words within your content to show relevance, and in short, that’s the objective of using what’s known as LSI keywords.

How to Choose the Best LSI Keywords

The specific part is LSI keyword research. The challenge is selecting the most relevant keywords for your content and having a respectable amount of search traffic. Therefore, you must first comprehend the motivation behind the look for the particular item or piece of information. Finding relevant keywords that fit easily into the content is the next step.

  1. Intent

A person typically has one of the following three intentions:

  • Research Material

People are interested in learning more about the issue at hand in this instance. Most of the time, they seek general knowledge. People might be interested in learning what a website is and why you need one, for instance (keeping with our search word “website”).

  • Navigate

Such searches frequently have a clear path in mind. For instance, in this situation, people might want to know how to create a website using WordPress or the best framework for creating an e-commerce website.

  • Transact

As the name implies, people use search phrases with transactional intent when they want to complete a particular job. In this instance, it might involve working with a site design firm.

  1. Context

LSI keywords that are highly relevant to your material must be used. Only after that will a search engine be able to index and rank your website in the SERPs (SERPs).

For instance, it makes sense to use LSI keywords like “small business website design,” “cheap business website builder,” “website development,” and “website hosting” if you provide website design and development services for small companies.

Does this imply that you can use as many LSI keywords as feasible? NO is the response! Not every keyword will fit into the content. Therefore, you should only employ those that seem appropriate and significant. Check to see if everything flows effortlessly. Don’t leave anything behind.

The next thing to watch out for is overusing LSI keywords in the text. Avoid using one LSI term more often than the others out of caution. Make careful to distribute them evenly throughout the content.

Does Google use LSI?

It’s understandable why people assume Google employs LSI technology, given the issues LSI solves. After all, it is evident that search engines cannot reliably return relevant documents by matching exact queries.

Additionally, we regularly observe proof that Google is aware of synonymy:

Google almost certainly does not make use of LSI technology, despite this.

Here are three facts that will serve as proof of this statement:

LSI is an outdated technology.

The World Wide Web didn’t exist until the 1980s when LSI was first developed. As a result, it was never meant to be utilized with this many papers.

Because of this, Google has since created more advanced, adaptable technology to address the same issues.

Bill Slawski captures it best:

LSI technology wasn’t created for anything the size of the Web […] Google has developed a word vector approach (used for Rankbrain) which is much more modern, scales much better, and works on the Web. Using LSI when Word2vec is available would be like racing a Ferrari with a go-cart.

LSI was developed to index well-known document archives.

The World Wide Web is active in addition to being huge. This implies that Google’s database, which contains billions of pages, constantly evolves.

The LSI patent states that the analysis must be performed “each time there is a major update in the storage files,” which is an issue. It would require a lot of processing capacity to do that.

LSI is a patented technique.

Bell Communications Research, Inc. received the Latent Semantic Indexing (LSI) invention in 1989. One of the co-inventors, Susan Dumais, continued to work on the technology after joining Microsoft in 1997 and developing search-related inventions.

The LSI invention did, however, expire in 2008 because US patents have a 20-year lifespan.

This is yet another evidence to indicate that Google doesn’t use LSI because, before 2008, it was reasonably adept at comprehending language and providing relevant results.

Once again, Bill Slawski captures it best:

Google does attempt to index synonyms and other meanings for words. But it isn’t using LSI technology to do that. Calling it, LSI is misleading people. Google has been offering synonym substitutions and query refinements based upon synonyms since at least 2003, but that doesn’t mean that they are using LSI. It would be like saying you are using a smart telegraph device to connect to the mobile web.

The Impact of LSI Keywords on SEO

The Impact of LSI keywords on SEO - iRocket VC

Initially, Google’s crawlers, also known as its “spiders,” would automatically locate and scan webpages by following links on related web pages. They would scan a page’s keywords to determine its subject as they crawled.

If you were to write an article with the title “21 Tips For Effective Email List Segmentation,” for instance, Google would scan your page to see if you had used the phrase “email list segmentation” in significant places, such as:

  • Title element,
  • Body of the content,
  • Alt text for images,
  • H1 heading, H2 and H3 subheaders, and so forth.

However, Google’s crawling strategy altered following the LSI update, leading to these SEO advancements:

Google has improved page understanding

Now, it would also search your page for several related keywords, such as “email campaign,” “MailChimp,” “audience,” “subscribers,” “email tools,” and so forth, in addition to searching for the primary keyword. This means that rather than just searching for multiple instances of a particular keyword, Google tries to determine the general subject of a page. To do this, it uses latent semantic indexing.

Google contextually analyzes web pages.

In essence, Google’s algorithm can now “read” a page just like a person would, classifying keywords according to the determined context.

As a result, the search engine can now distinguish even the tiniest differences between words. It can now distinguish between literal and figurative phrases, for example:

If LSI keywords are irrelevant, don’t force them into your text.


“Protect shoes when putting them on with a wedge.”

Google can produce even more relevant results.

In a recent study paper, Google claims that to make it easier for bots to grasp the main subject of scanned pages, they identify words that frequently occur together. Results are even more pertinent when classification is done correctly.

Results from LSI keywords are more relevant.

Google takes into account your company’s overall image.

Additionally, their algorithm is made to consider your company name, website, and sector to give Google a comprehensive grasp of each page on your site about your business as a whole.

Can you now see why LSI terms have become a significant component of search engine algorithms?

Even for the 15% of search terms that have never been searched, Google’s primary objective is to offer searchers the most relevant results. Without latent semantic indexing, the search engine would not be able to meet that incredible level of quality.

LSI keyword Tools

Although it can be challenging to locate LSI keywords, understanding where to find them is simple. Interestingly, Google is not the only place to find LSI terms; there are also other sources.

Here is a comprehensive list of tools for finding LSI Keywords:

Google Autocomplete Feature

The simplest method to find keywords related to your primary keyword is to use Google’s instant search feature. Every time you enter a search term into the Google search bar, Google’s autocomplete function anticipates it. This function is an excellent resource for different search keywords.

Locate your chosen subjects when conducting your LSI research and planning to take full advantage of the autocomplete feature. Then, enter your goal keyword into Google’s search bar to get various suggestions for what you might type next.

Look for the phrases that are suggested by the bold type. Include a summary of the ones that apply to your subject in your writing.

Google Keyword Tool – Keyword Planner

A function of Google Ads, formerly known as AdWords, is the Google search planner. With the aid of this planner, you can identify the best keywords and estimate their search traffic.

The purpose of the keyword planner is to assist search engine advertisers in determining the best keywords to use for lower-cost, higher-ranking advertisements.

However, you can use the term planner to find LSI keywords if you have a Google Ads account.

Enter a seed keyword into the “Discover New Keywords” tool and click “Get Results” to discover LSI keywords using Google Keyword Planner.

Semrush SEO Content Template Tool

Another excellent tool for identifying the keywords that are semantically connected to your target keyword based on the top site ranking is the Semrush SEO Content Template Tool (s).

There is a section with “semantically related words” and a box with “key suggestions.”

These are based on your top 10 competitors for those terms on Google. Include these in your content to guarantee that you are discussing the same subjects and using the exact words as those pages that already rank.

Analyzing the “People Also Ask” Results

The “People Also Ask” box on the search results screen is another beneficial and cost-free resource that will give you many more choices. Look into a few of the findings to see if you can use other words.

You can use the People Also Ask results to generate more ideas, just as related searches on Google are an excellent way to discover related keywords for your content.

The “People Also Ask” box is a user-interactive Google search result that presents a list of queries other users have made in connection with your initial query.

Utilizing the tool makes it incredibly simple to analyze these findings.

After entering your primary keyword, take a moment to watch as the PAA boxes expand and provide you with suggestions for other words to use that are semantically related.

LSI Graph

With the help of the free LSI Graph tool, you can quickly discover every term connected to your primary keyword. This website is a fantastic resource for studying, optimizing, and fine-tuning your content.

Just enter the primary keyword for your website to get a list of LSI terms to choose from.


There is no denying that you should use semantically related terms in your content, even though there is an ongoing discussion in the SEO community about whether LSI keywords are legitimate.

It is worthwhile investing the time to learn how to use these valuable keywords in your SEO strategy and content marketing efforts because the search engine uses LSI keywords more and more to determine the context of any piece of content.

Using semantically related words and phrases is excellent when they naturally suit. Include steps to find these in your keyword research process, sprinkle them throughout your content, and you’re ready. If required, add a new section or sections.