Semantic Similarity and Keyword Cannibalisation: Understanding the SEO Connection
SEO is no longer simply about adding the same keyword repeatedly to a page. Search engines have become much better at understanding meaning, context, search intent, and the relationship between topics. Two concepts that are particularly important for modern SEO are semantic similarity and keyword cannibalisation.
While they may sound technical, understanding them can help you create better content, avoid unnecessary competition between your own pages, and build a stronger website structure.
What Is Semantic Similarity in SEO?
Semantic similarity refers to how closely two words, phrases, or pieces of content are related in meaning or context.
For example, consider these terms:
Digital marketing
SEO
Search engine optimisation
Organic traffic
Keyword research
Content optimisation
These keywords are not identical, but they are semantically related because they belong to the broader topic of digital marketing and SEO.
Search engines can understand these relationships. This means a page does not necessarily need to repeat one exact keyword throughout the content to demonstrate relevance.
For example, if you are writing about SEO for small businesses, naturally discussing topics such as local SEO, Google Business Profile, keyword research, website optimisation, backlinks, and organic traffic can help establish the overall subject of the page.
Why Does Semantic Similarity Matter?
Imagine searching for:
"How can I improve my website visibility?"
A useful article might use phrases such as:
improve search rankings
increase organic traffic
optimise website content
search engine optimisation
improve online visibility
The wording is different, but the concepts are connected.
This is why modern SEO content should focus on covering a topic comprehensively rather than mechanically repeating one keyword.
Semantic relevance can also help search engines understand what your page is about and how it relates to other pages on your website.
What Is Keyword Cannibalisation?
Keyword cannibalisation happens when multiple pages on the same website target the same or very similar search intent, causing those pages to compete with each other.
For example, suppose a digital marketing agency has these three pages:
Best Digital Marketing Company in Kochi
Top Digital Marketing Agencies in Kochi
Digital Marketing Services in Kochi
If all three pages are primarily trying to rank for the same search intent such as someone looking for a digital marketing agency in Kochi they may end up competing with one another.
The problem isn't simply that they contain the same words.
The bigger issue is that their purpose and search intent are too similar.
Keyword Cannibalisation Example
Imagine you have:
Page A:
"Best SEO Services in Kochi"
Page B:
"Top SEO Company in Kochi"
Page C:
"SEO Agency in Kochi"
If all three pages provide almost the same information and target the same audience, Google may have difficulty determining which page should be the primary result.
Instead of creating three strong pages with distinct purposes, you may have three pages competing for similar visibility.
Semantic Similarity vs Keyword Cannibalisation
These two concepts are connected, but they are not the same.
Semantic Similarity
Keyword Cannibalisation
Focuses on meaning and context
Focuses on competing pages
Helps search engines understand topics
Can create ranking conflicts
Similar concepts can be useful
Similar search intent can be problematic
Supports topical relevance
Can weaken page-level targeting
Usually desirable
Usually something to investigate
For example, having the terms SEO, organic traffic, keyword research, and search rankings on one page is perfectly normal.
But having five different pages targeting essentially the same query and providing almost identical information could create a cannibalisation problem.
How Semantic Similarity Can Accidentally Cause Cannibalisation
This is where things become interesting.
Suppose a website publishes several articles around the topic of SEO:
What Is SEO?
How Does SEO Work?
SEO Tips for Beginners
How to Improve SEO
Best SEO Strategies
SEO Techniques for Small Businesses
Having related content isn't automatically bad.
In fact, building a group of related articles can create a strong topic cluster.
The problem occurs when these articles become so similar that they answer the same question.
For example:
"How to Improve SEO"
and
"Best SEO Strategies"
may end up covering almost identical topics.
Their titles are different, but their semantic meaning and search intent may be extremely similar.
That's when you should evaluate whether both pages are genuinely necessary.
How to Identify Keyword Cannibalisation
Don't simply look for duplicate keywords.
Instead, look at search intent and ranking behaviour.
1. Check Your Google Search Console Data
Google Search Console can show which pages are receiving impressions and clicks for particular queries.
Look for situations where multiple URLs repeatedly appear for the same important query.
For example:
Query: digital marketing company in Kochi
Page A → 5,000 impressions
Page B → 2,800 impressions
Page C → 1,900 impressions
This doesn't automatically prove cannibalisation, but it is a reason to investigate.
2. Compare the Search Intent
Ask:
"Would someone searching this keyword be looking for the same thing on both pages?"
If the answer is yes, the pages may be competing.
3. Compare the Content
Look at the pages side by side.
Are they:
answering the same questions?
targeting the same audience?
offering the same service?
using similar headings?
targeting similar keywords?
providing almost identical information?
If so, consider consolidating or differentiating them.
How to Fix Keyword Cannibalisation
There isn't one universal solution. The right approach depends on why the pages overlap.
Option 1: Differentiate the Search Intent
Instead of deleting a page, give it a clearly different purpose.
For example:
Page 1:
Digital Marketing Services in Kochi
Page 2:
Digital Marketing for Real Estate Businesses in Kochi
Page 3:
Digital Marketing for Small Businesses
Now each page has a more specific audience and purpose.
Option 2: Consolidate Similar Pages
If two pages provide essentially the same information, combining them into one stronger resource may be better.
You can then redirect the weaker/duplicate URL to the primary page when appropriate.
Option 3: Improve Internal Linking
Internal links can help establish relationships between pages.
For example:
Main page:
SEO Services in Kochi
Supporting articles:
How Keyword Research Works
Local SEO for Small Businesses
How to Improve Google Rankings
Technical SEO Checklist
Linking these pages logically helps users and search engines understand the relationship between them.
Option 4: Give Each Page a Unique Primary Topic
Before publishing a new article, ask:
"Do I already have a page that answers this question?"
If yes, consider updating the existing page instead of creating another article.
This simple habit can prevent content duplication and unnecessary keyword competition.
Don't Be Afraid of Related Keywords
One common misconception is that every page must have completely different keywords.
That's not how modern SEO works.
Two pages can naturally contain many of the same words.
For example, an article about local SEO may naturally mention:
Google Business Profile
local rankings
citations
reviews
backlinks
keywords
Another article about Google Business Profile optimisation may also mention some of these terms.
That doesn't automatically mean cannibalisation.
The key question is:
Are the pages serving different search intents?
If they are, semantic overlap is often completely natural.
A Better SEO Approach: Build Around Topics and Intent
Instead of creating a separate page for every keyword variation, think in terms of:
Topic → Search Intent → Page Purpose → Supporting Content
For example:
Main Topic
Digital Marketing
Commercial Page
Digital Marketing Services
Informational Content
What Is Digital Marketing?
Educational Content
Digital Marketing Strategies for Small Businesses
Specific Supporting Content
How SEO Helps Small Businesses Get Organic Traffic
Each page has a different job, even though they share many semantically related terms.
