What is the difference between keywords and topics?
Keywords are the exact words and phrases people type into search engines. “Green tea” is a keyword. “Green tea benefits” is another keyword. “Is green tea good for you” is yet another.
Topics are the broader subjects that connect related keywords. The topic “green tea” encompasses all those searches, including “matcha vs green tea,” “best green tea brands,” “green tea caffeine content,” and dozens more. Topics group similar content keywords that share the same underlying intent.
The shift from keywords to topics isn't just semantic. It can change how search engines evaluate your site and how much organic visibility you can capture. When you think in topics rather than individual keywords, you create fewer, stronger pages instead of many thin ones.
Keywords vs topics: a practical example
For an e-commerce site selling home office furniture, here's how the two approaches differ.
Keyword-focused approach
Create separate pages for each keyword:
- •/ergonomic-office-chair
- •/best-ergonomic-chair
- •/ergonomic-chairs-for-back-pain
- •/office-chair-lumbar-support
- •/comfortable-desk-chair
Problem: These pages compete with each other. Search engines see duplicate intent and split visibility between them.
Topic-focused approach
Create comprehensive pages for each topic:
- /ergonomic-office-chairs: covers all ergonomic/comfort-related searches
- /executive-office-chairs: covers style/status-related searches
- /office-chairs-under-500: covers budget-related searches
Result: Each page can build authority for its topic. The site may capture more total visibility with fewer keywords to manage and fewer pages to maintain.
Why search engines now favor topics over keywords
Google's algorithms have evolved significantly. John Mueller, Google's Search Advocate, has said: “Search engines will get better over time to understand more than just the words on a page.”
Modern search engines appear to evaluate:
- 1Topical authorityDoes your site demonstrate expertise on this subject across multiple pages? Topics SEO is about building depth, not breadth.
- 2Content depthDoes the page thoroughly address the user's underlying intent, as outlined in Google's helpful content guidelines?
- 3Semantic relationshipsHow well does your content connect related concepts and similar topics through semantic understanding?
A single comprehensive page on “ergonomic office chairs” can now rank for dozens of related keyword variations (something that wasn't possible in the keyword-matching era).
Why fewer keywords often means better results
The shift from keywords to topics changes how you should think about your category structure and content strategy.
Fewer pages, more visibility
Instead of hundreds of thin pages competing with each other, you build fewer comprehensive pages that each rank for many related searches. Targeting fewer keywords per page paradoxically captures more total search visibility.
Better user experience
Customers find what they need faster. A well-organized topic page answers multiple questions in one place, which can help reduce bounce rates.
Reduced maintenance
Maintaining 50 strong pages is easier than maintaining 500 weak ones. Updates and improvements tend to compound on pages that already have authority.
Clear site architecture
Topic-based navigation helps customers understand your product range. Categories make sense to humans, not just search engines.
Future-proof content
As AI search tools expand queries into multiple related searches, topic-organized sites may capture more visibility from each user question.
Efficient resource allocation
Your team can focus on making pages genuinely helpful instead of creating keyword variations that dilute your efforts across topics and keywords.
How to identify topics (not just keywords)
The key is grouping keywords by user intent, not by superficial word similarity. This is the core difference between keywords and topics in practice.
Look at search results overlap
If two keywords show similar search results, they belong to the same topic. Google has already determined they serve the same intent. Creating separate pages for each wastes effort and creates internal competition.
Group by customer need
Ask: “What is the customer trying to accomplish?” Someone searching “ergonomic chair” and “chair for back pain” wants the same thing: comfort. They belong on the same page.
Consider the purchase journey
Different topics often align with different stages: awareness (“types of office chairs”), consideration (“ergonomic vs executive chair”), and decision (“best ergonomic chair under $500”).
Run a content audit
Audit your existing pages to find where you have multiple URLs targeting similar topics. Consolidating these into single, authoritative pages often produces immediate ranking improvements because you stop diluting your own topical authority.
Example: Clustering keywords into topics
Topic: Ergonomic Office Chairs
- • ergonomic office chair
- • best ergonomic chair
- • chairs for back pain
- • office chair lumbar support
- • comfortable desk chair
- • posture correcting chair
Topic: Standing Desks
- • standing desk
- • sit stand desk
- • adjustable height desk
- • electric standing desk
- • standing desk converter
Each topic becomes one comprehensive page that can rank for all related terms. Topic clustering for SEO eliminates the guesswork of deciding which keywords deserve their own page.
The challenge: doing this across thousands of pages
For e-commerce sites with thousands of products, identifying and organizing topics manually is impractical.
Thousands of keyword variations
A furniture retailer might have 50,000+ relevant keywords. Grouping them manually into topics and keywords could take months depending on team size and methodology.
Constantly changing inventory
Products come and go. Topics that made sense last quarter may not align with current stock.
Search behavior evolves
Customer language changes. New terms emerge. Yesterday's keyword groupings become outdated.
How Similar AI automates topic organization
Similar AI's Topic Sieve automatically filters and validates candidate topics by running them through five checks, including search demand, product sufficiency, existing traffic, page competition, and product match, to identify which ones represent genuine opportunities worth building, using signals similar to those Google is believed to use.
The Topic Sieve runs candidate topics through multiple checks, including search demand validated against real search data, product sufficiency, existing traffic and rankings, page competition, and product-SERP relevance, to identify which topics are worth building new category pages for and discard those unlikely to drive incremental revenue. It also surfaces similar topics you may have missed.
Then the Similar AI's New Pages Agent builds comprehensive category pages for each validated topic, complete with content from Content Agent, relevant product matches, and intent-driven internal links from the Linking Agent, which uses SERP similarity analysis to connect related pages and help customers browse.
See this in action
How Visual Comfort uses topic-based pages to drive $2.4M in incremental revenue
Visual Comfort, a premium lighting retailer, worked with Similar AI to evaluate topic opportunities across their product range. For example, the Topic Sieve can evaluate thousands of potential topics and narrow them down to the ones worth building. By creating comprehensive, topic-organized category pages, they achieved, according to Jennifer Skeen, 29x ROI in the first year.
“The most important benefit is that we were able to deliver seven-figure annual incremental revenue growth with 29x ROI. Using Similar AI pages also saves significant time and allows us to quickly respond to market trends and consumer behavior.”
- Jennifer Skeen, VP of e-commerce, Visual Comfort
$2.4M
Incremental annual revenue
29x
Return on investment
0
Additional headcount
Frequently asked questions
What is fewer keywords in SEO?
Fewer keywords refers to a strategy of targeting a smaller, more focused set of search terms rather than chasing every possible variation. By concentrating on fewer keywords grouped under broader topics, each page builds stronger authority and ranks for more related queries naturally.
Can you have a few keywords as a single keyword?
Yes. A single keyword can actually be a multi-word phrase, often called a long-tail keyword. For example, 'ergonomic office chair for back pain' counts as one keyword even though it contains multiple words.
What is the difference between keywords and topics?
Keywords are the specific words and phrases people type into search engines, while topics are the broader subjects that connect groups of related keywords. A topic like 'ergonomic office chairs' encompasses dozens of individual keywords such as 'best ergonomic chair,' 'chair for back pain,' and 'office chair lumbar support.'
Related capabilities
How Similar AI helps e-commerce brands organize around topics.
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