What are LSI Keywords in Search Engine

LSI means Latent Semantic Indexing, LSI Keywords are keywords related to the keyword that you are looking for on any search engines such as Google and Google does this by using a system known as LSI (Latent Semantic Indexing). In short, they are keywords that are based on user behavior and it is related to another search term.
The web page is crawled by search engine bots and the most common words and phrases are collected, combined and identified as the keywords for that particular page. In LSI approach, search engine bots not only use meta tags and keywords appear several times, but it also looks for synonyms related to a particular word, and assign it as your webpage keyword and rank it higher than other sites competing for the same keyword.

LSI keywords act as synonyms of the target keyword. It’s more accurate and most commonly correlated (semantically related ) with your targeted keywords and increases your chances to get higher ranking in Google.
These keywords, you will generally find at the bottom of Google’s SERP.

Role of LSI in Search Engine Optimization (SEO)

Latent semantic indexing not only examines keywords in any particular document but also looks for the collection of a document for the keyword in text analysis. This semantic model gives the search engine an overview of how closely these documents are related. A set of Documents that are semantically co-related gives the search engine an idea about how relevant a website is for a particular topic or keywords.

Lexical indexing is completely based on the Lexical analysis. Lexical analysis is the processing of an input which can be a form of a sequence of characters that will be produced as output. A sequence of characters or symbols called lexical tokens. A lexical analyzer will be divided into two phases. The first phase is known as a scanner and the second phase is known as an evaluator. The Latent Semantic Indexing is depending on these two states. LSI based search engine optimization is much more complex in comparison to normal search engine optimization(SEO). The search ranking for a particular website will have to pass several processes in the latent semantic indexing based search engine optimization. This process will contain the occurrence of a keyword in a document and a close relationship with the other words of the document.
Therefore, if you will search in the LSI indexed database, then the SE looks for the most similar values it has calculated and shows the result best-fitted websites according to query.

Where to Use LSI Keywords?

LSI keywords are mostly the highlighted words and phrases in the search result descriptions and are considered the most relevant to the original keywords.

Let’s see where to use the LSI keywords for better results

•  A good meta description is extremely helpful when it comes to SEO. Use your main keyword and LSI keywords and phrases in your description.
• Write Natural Content: Avoid adding more than two LSI keywords to the main keyword and always try to write natural content for the blog post.
• Your best LSI keywords can easily be discoverable by conducting a search using your main keyword.
• The phrases and relevant words that are highlighted and pop up at the bottom of the search page are the LSI keywords.
• Use of Alt tag: Blog Image should have a primary keyword alt tag
• Keyword stuffing: Keyword Stuffing. Avoid keyword stuffing, i.e don’t use keywords frequently in order to increase the keyword density. See What Google says about Keyword stuffing.

Some Free LSI Keywords Generator tools

Before jumping into the free LSI keywords generator tools, first, try to identify the keyword or keywords which you will try to target for your content. You can use Semrush or Google Keyword Planner Tool to find your targeted keywords for the content. I prefer Semrush, as it gives a complete idea of the targeted keywords as well as a related keyword with search volume. You can check ranking keywords of your close competitors and find out which other search terms they benefit from.

Here’s a snapshot of Semrush Keyword analysis dashboard

Here are some free LSI Keywords tools you can use to improve your search ranking

1.  LSIGraph

LSI Graph is a simple yet commonly used free LSI keyword tool. Without signup, you only get a few searches a day including around 50 LSI keywords each. Even after signup, the daily search query limit increases only to around 20 search queries.

You can use this tool to generate many long-tail keywords, meaning that a keyword usually contains at least three words, as well as questions and sentences that could be used as the title of your blog.

LSI Graph does not give the option to export either the full generated list or a selection of the list. However, the LSI keyword list can easily be copied and pasted into other documents.

2. Google

You can always use the Google Search page to find your relevant LSI keywords. At the bottom of the search result, you will find your targetted keywords.

3. Niche Laboratory

This is also a free LSI keyword generator tool that generates not only the keywords you are looking for but also the lot more information relevant to your content. Such as a list of top web pages, article ideas, long-tail keywords, resources, related niches, a brief competition analysis, and more.

4.Twinword SEO Plugin

Very useful and easy to use WordPress plugin for finding the LSI Keywords for your blog. This plugin automatically suggests LSI keywords related to your post while you are writing.

It also provides each keyword’s monthly search volume, number of results, and KEI (Keyword Efficiency Index). With this information, The free version of this plugin supports 5 search queries per day.

You can download the plugin from here.

5.KWFinder

Another great keyword suggestion tool for your blog. This LSI tool generates keywords mostly containing more than one word, making it easy for you to generate the right words to use in your content.

The free version of KWFinder gives you only a few search queries per day that include around 50 generated keywords each. Further, you can choose between suggestions, autocomplete, or questions, and you can filter for countries and languages including the option to search for any country and any language.

Any of these LSI tools can be a great addition to your SEO analysis and finding the targeted keywords of your blog content. I hope this blog post was helpful to find the right free LSI tool for you. If you like the article, please share your views in the comment section.