What Are LSI Keywords

LSI keywords are often described as words and phrases related to your main keyword. However, the term is widely misunderstood in modern SEO.

In simple terms, SEO professionals often use “LSI keywords” as shorthand for related words, concepts, entities and search terms that add context to a topic.

Here is the important part: Google does not provide a special list of LSI keywords that you need to add to your pages.

Google’s search systems use many signals to understand content, relevance and search intent. That means good SEO is no longer about repeating one keyword or adding a checklist of related phrases.

It is about covering a topic clearly and naturally.

In this guide, Wixdek explains what LSI keywords mean, where the term came from, how modern semantic search works, and how to find useful related terms in 2026.

What Are LSI Keywords?

In modern SEO discussions, LSI keywords usually mean words and phrases closely connected to your main topic.

For example, imagine your main keyword is:

SEO

Related terms might include:

• search engine optimisation
• organic search
• search rankings
• keyword research
• technical SEO
• on-page SEO
• search intent
• Google Search
• content optimisation

You do not need every term on every SEO page.

The goal is simply to cover the concepts that are useful for the reader.

That difference matters.

A page should not include related terms because an SEO tool gives you a list. It should include them because they help explain the subject properly.

LSI Keywords Meaning in Simple Terms

The easiest way to understand LSI keywords is to forget about complicated terminology.

Think of them as context around your main topic.

Imagine a page about “Apple.”

That word could describe:

• a fruit
• a technology company
• a product brand

Other words on the page provide context.

If the page mentions iPhone, MacBook, iOS and technology, its meaning becomes clearer.

If it mentions fruit, trees, orchards and nutrition, the subject is completely different.

This is why context matters in search.

However, that does not mean Google is checking your page against a secret list of LSI keywords.

Modern search systems use much more advanced methods to understand pages and queries.

What Does LSI Mean?

LSI stands for Latent Semantic Indexing.

The concept comes from information retrieval research rather than modern SEO.

Latent Semantic Analysis uses mathematical relationships between words and documents to identify patterns in how terms appear together.

The original research dates back decades and was designed to improve information retrieval.

This is very different from the way many SEO articles use the phrase “LSI keywords.”

There is no official Google feature where you enter a keyword and receive a required list of LSI terms.

This is why the phrase can be misleading.

If you want to explore the technical history, the original research on Latent Semantic Analysis explains the underlying information-retrieval method.

Does Google Use LSI Keywords?

Not in the way SEO tools and older articles often suggest.

Google’s public documentation describes automated ranking systems that use many signals and systems to understand and rank pages.

It does not describe an “LSI keyword” ranking system where publishers must add a particular set of related phrases.

Google also explains in its guide to how Google Search works that it analyses page content during indexing before matching relevant pages with search queries.

So the useful lesson behind the LSI keyword idea remains valid:

Context matters.

The outdated part is believing there is a special LSI keyword list that directly improves rankings.

LSI Keywords vs Related Keywords vs Semantic SEO

These terms are often mixed together, but they are not identical.

LSI keywords

This is an informal SEO term commonly used for words related to a target keyword.

It should not be treated as a technical Google ranking factor.

Related keywords

These are search terms connected to your main subject.

For example, people researching “local SEO” might also search for:

• local SEO strategy
• Google Business Profile optimisation
• local keyword research
• local citations
• local search rankings

Synonyms

Synonyms are words with similar meanings.

For example:

car → vehicle

However, related keywords are not always synonyms.

Entities

Entities can include identifiable people, places, companies, products or concepts.

They can help establish what a page is actually discussing.

Semantic SEO

Semantic SEO focuses on meaning, context, relationships, search intent and complete topic coverage instead of relying only on exact-match keywords.

For modern SEO, this is a more useful way to think about content than searching for a fixed list of “LSI keywords.”

Why People Still Search for LSI Keywords

“LSI keywords” remains a popular SEO phrase because it offers a simple explanation for a real problem.

That problem is thin keyword-focused content.

Years ago, someone might optimise a page for:

SEO agency London

Then repeat that phrase again and again.

Modern content should do much more.

A useful page might naturally discuss:

• SEO strategy
• technical audits
• keyword research
• organic traffic
• search intent
• content optimisation
• internal linking
• website structure
• conversions

These concepts help readers understand the service properly.

They also create a more complete page than repeating one exact phrase.

Common Myths About LSI Keywords

There is still a lot of outdated advice around this subject.

Myth 1: Google Has an LSI Keyword Database

There is no public Google tool containing a required list of LSI keywords for each search query.

Myth 2: You Need a Certain Number of LSI Keywords

There is no ideal LSI keyword count.

You could use five related terms or fifty.

What matters is whether they genuinely help explain your subject.

Myth 3: LSI Keywords Are a Ranking Shortcut

Adding related phrases does not automatically improve rankings.

A page still needs useful information, relevant search intent, sound SEO foundations and a good user experience.

Myth 4: Every Related Keyword Should Appear on the Page

Trying to include every related phrase can make your writing unnatural.

Use terms when they help the reader.

Leave them out when they do not.

How Google Understands Content Today

Google does much more than count keyword repetitions.

During indexing and ranking, its systems analyse page content and use many different signals to determine relevance.

Google’s ranking systems guidance explains that multiple automated systems and signals help determine which content appears for a query.

This makes complete topic coverage valuable.

For example, a useful guide about keyword research might naturally explain:

• search volume
• keyword difficulty
• search intent
• commercial keywords
• informational keywords
• competitor research
• Google Search Console
• topic clusters

Those subjects belong together because they help someone understand keyword research.

They are not useful simply because they are “LSI keywords.”

That distinction is important.

Examples of LSI Keywords

Here are a few simple examples.

Main Topic: SEO

Related concepts could include:

• search engine optimisation
• organic traffic
• search rankings
• search queries
• Google Search
• on-page SEO
• technical SEO
• backlinks
• keyword research
• content optimisation

Main Topic: Emergency Plumber London

Related concepts might include:

• leaking pipes
• burst pipes
• blocked drains
• emergency call-outs
• boiler problems
• water leaks
• plumbing repairs
• service areas
• response times

Not every plumbing page needs every phrase.

A page about emergency plumbing should include only information relevant to that particular service.

Main Topic: Running Shoes

Related concepts could include:

• cushioning
• heel support
• running surface
• shoe size
• road running
• trail running
• stability
• pronation
• lightweight shoes

Again, these terms make sense because they belong to the topic.

How to Find Related Keywords

You do not need a dedicated “LSI keyword generator.”

Start with real search behaviour.

Use Google Autocomplete

Begin typing your main subject into Google.

Autocomplete can show searches connected to the topic.

These suggestions can help you understand the language searchers use.

Check Related Searches

Google may show related searches connected to the original query.

These can reveal additional angles worth researching.

Review People Also Ask

People Also Ask results can uncover questions readers want answered.

Those questions can also help you build better headings and FAQs.

Use Google Search Console

Search Console is particularly useful once your page starts receiving impressions.

Look at the queries already triggering your page.

You may discover relevant searches you have not covered clearly enough.

Analyse Competitor Coverage

Review strong pages ranking for your target topic.

Do not copy their wording.

Instead, look for common questions, concepts and subtopics that users expect to find.

Then decide where your content can provide something clearer, deeper or more useful.

Do Proper Keyword Research

Related terms should support a wider keyword strategy.

Our guide to keyword research explains how to evaluate search intent, group related queries and build topic clusters without creating unnecessary pages.

How to Use LSI Keywords Properly

The best approach is simple:

Do not force them.

Write a useful answer first.

Then review whether important ideas are missing.

Related terms can naturally appear in:

• headings
• supporting paragraphs
• examples
• FAQs
• internal link anchor text
• image descriptions when they genuinely describe the image

Do not add a term to image alt text simply because you want another keyword mention.

Alt text should primarily describe the image clearly and help accessibility.

Content Optimisation Without Keyword Stuffing

There is a major difference between topic coverage and keyword stuffing.

Topic coverage helps someone understand a subject.

Keyword stuffing repeats words mainly to influence rankings.

Google’s spam policies on keyword stuffing specifically warn against unnatural repetition designed to manipulate search results.

For example, this sounds forced:

“Need an SEO agency London? Our SEO agency London offers SEO agency London services for anyone searching for an SEO agency London.”

That adds no value.

A natural version would be:

“Wixdek provides SEO services for London businesses that want stronger organic visibility, qualified traffic and more enquiries.”

Same topic.

Much better experience.

Our on-page SEO guide and service also explains how content, headings, internal links and page intent work together without relying on keyword stuffing.

How Related Terms Improve Content Quality

Related terms are useful when they help you cover a topic properly.

They can improve:

Clarity

Supporting concepts help readers understand complicated subjects.

Topical Coverage

A complete page answers important questions instead of focusing on one phrase.

Search Intent Alignment

Related questions can reveal what someone actually wants from the page.

Internal Linking

Related subjects create natural opportunities to connect useful pages.

Reader Experience

People should leave your article feeling their question has been answered.

That matters more than reaching a keyword count.

Practical Example: Optimising a Service Page

Imagine you are writing a page targeting:

Emergency plumber London

A weak approach might repeat that exact keyword twenty times.

A better approach starts with the customer’s problem.

Someone needing an emergency plumber may want to know:

• What problems can you fix?
• Which areas do you cover?
• When can someone attend?
• Are emergency call-outs available?
• What should I do while waiting?
• What information should I provide when calling?
• How is pricing explained?

Answering those questions naturally introduces relevant vocabulary.

You have now created deeper topic coverage without chasing an artificial LSI keyword score.

This same principle applies to most industries.

Should You Use LSI Keyword Tools?

You can use SEO tools to discover related ideas.

However, do not treat their recommendations as rules.

A tool might suggest twenty terms.

Your article might genuinely need twelve.

Another article might require thirty.

Use tools to discover possibilities.

Then use judgement to decide what belongs on the page.

That approach is also covered in our keyword research guide, where we explain how to group terms based on intent rather than building pages around every small keyword variation.

Common LSI Keyword Mistakes

Several mistakes can weaken otherwise useful content.

Adding Every Suggested Term

More keywords do not automatically mean better content.

Writing for an SEO Score

A content optimisation score can provide guidance, but readers should come first.

Treating Related Terms as Ranking Factors

A particular word is not automatically valuable because an SEO tool labels it semantically related.

Ignoring Search Intent

Excellent terminology cannot rescue a page that answers the wrong question.

Using Awkward Internal Link Anchors

Internal links should help users discover relevant information.

Do not force exact-match keywords into every anchor.

Forgetting Technical SEO

Content quality matters, but search engines still need to crawl, index and understand your website.

Our technical SEO services cover crawling, indexing, site structure and other technical issues that can affect organic visibility.

LSI Keywords and E-E-A-T

Related terminology does not create E-E-A-T by itself.

Google uses E-E-A-T as a concept within its search quality guidance, rather than describing it as one single ranking factor.

Strong trust signals can include:

Experience

Show genuine knowledge where first-hand experience is relevant.

Expertise

Explain complicated subjects clearly and accurately.

Authoritativeness

Build useful content around subjects your business genuinely understands.

Trust

Use accurate information, transparent authorship and reliable sources.

Google’s people-first content guidance recommends clear sourcing, useful original information and evidence of who created the content.

For a blog like this, useful trust signals could include:

Author: Wixdek SEO Team
Last reviewed: September 2026
Sources: Google Search Central and original information-retrieval research

Only publish author or reviewer information that is accurate.

LSI Keywords, Semantic SEO and AI Search in 2026

Search continues to become more focused on meaning and useful answers.

Google’s current guidance for its AI search experiences still recommends the same foundations:

Create original, helpful content for people.

That means you do not need a secret optimisation method for AI Overviews or AI Mode.

Strong fundamentals still matter:

• useful original information
• clear structure
• relevant supporting concepts
• strong internal linking
• accessible pages
• good technical SEO
• accurate sourcing

Google’s guidance for AI features in Search says the same core SEO practices continue to apply.

So chasing an “LSI keyword density” is unlikely to be the best use of your time.

Build a page that deserves to answer the query instead.

How LSI Keywords Fit Into a Full SEO Strategy

Related terminology is only one small part of SEO.

A broader strategy may include:

• keyword research
• search intent analysis
• technical SEO
• on-page optimisation
• content development
• internal linking
• authority building
• measurement and conversion tracking

Our SEO services in London combine these areas around search visibility, qualified traffic and measurable enquiries.

The key point is simple:

Related words support good content.

They do not replace a complete SEO strategy.

FAQs About LSI Keywords

Are LSI keywords still important in 2026?

The phrase is outdated, but the underlying idea of context remains useful. Focus on relevant concepts, natural language and complete topic coverage instead of chasing an LSI keyword list.

Does Google use LSI keywords?

Google does not publicly describe an LSI keyword system for ranking pages. Its documentation describes multiple systems and signals used to understand and rank content.

Are LSI keywords the same as synonyms?

No.

A synonym has a similar meaning to another word, while a related term may connect to the wider topic without meaning the same thing.

For example, “SEO” and “search engine optimisation” are closely related.

“Backlinks” is also related to SEO, but it is not a synonym for SEO.

How many LSI keywords should I use?

There is no ideal number.

Use as many related terms as necessary to explain the topic naturally.

Where should I put LSI keywords?

Use relevant terminology where it makes sense within headings, explanations, examples and FAQs.

Do not force keywords into every section.

Can LSI keywords improve Google rankings?

There is no direct LSI keyword ranking shortcut.

However, useful topic coverage can make content more complete, relevant and helpful to the people searching for that information.

Do I need an LSI keyword tool?

No.

Keyword research tools can help uncover related searches and topics, but you do not need a special LSI tool.

Google Search, Search Console, competitor research and standard keyword research can provide useful ideas.

What should I use instead of LSI keywords?

Think in terms of:

• related search terms
• supporting concepts
• entities
• synonyms
• search intent
• topic coverage
• semantic relationships

These ideas better reflect modern content optimisation.

Final Thoughts

LSI keywords are not a secret ranking technique.

The phrase survives because it describes an important idea in a simple way: your page needs context.

Do not repeat the same keyword until the page sounds unnatural.

Instead, answer the reader’s main question and cover the related concepts they genuinely need.

1. Use keyword research to understand demand.
2. Use natural language to explain the subject.
3. Use internal links to connect related information.

And use reliable sources when making technical claims.

That creates stronger content for readers while giving search engines clearer information about the page’s subject.

If you need help improving pages that receive impressions but struggle to rank or convert, explore Wixdek’s on-page SEO services or our wider SEO services in London.