The first client I ever built a semantic core for “from scratch” reacted to my Excel file with 3,000 keywords примерно так: “Why do we need 3,000 words? We only have 20 services.” This is a very common misunderstanding. People think keywords are simply “the names of what we sell.” In reality, a semantic core is a map of how your potential customers think and formulate their needs. And they think in very different ways.
The same person might search for you as “SEO services Kyiv,” “website promotion,” “how to rank a website on Google,” “why no one can find my site online,” or “how much does it cost to get to the top of Google.” All of these queries are about the same thing. But if your site is optimized only for “SEO services Kyiv,” you automatically lose up to 80% of potential customers.
“A semantic core is not just a list of words. It is a portrait of your customer expressed through search queries. The more accurate the portrait, the more relevant the traffic.” — Yurii Polishchuk
Why do most semantic cores fail?
Over the years, I’ve identified three common mistakes when building a semantic core. The first is focusing only on high-frequency keywords. “SEO” might have 10,000 searches per month. But the competition is extremely high, and the conversion rate is low because the query is too broad. “SEO for clothing e-commerce Kyiv” might have only 50 searches per month, but the user knows exactly what they want and is ready to pay. Low-frequency queries often convert 3–5 times better.
The second mistake is ignoring search intent. The query “SEO audit” can mean very different things: someone wants to learn how to do it themselves, someone is looking for a free checklist, or someone wants to заказать услугу. Optimizing one page for all these intents is a bad idea. Google is very good at distinguishing them.
The third mistake is “build it and forget it.” A semantic core is a living document. New queries appear, old ones lose relevance. I review my clients’ semantic cores once every quarter.
Step-by-step semantic core building: how I do it
Step 1. Brainstorming and seed keywords
I start by asking the client to write down 15–20 words and phrases they use to describe their business. Then I add synonyms, colloquial variations, and problem-based queries (not just solutions). For an SEO specialist, these would be: “SEO,” “website promotion,” “ranking,” “get to top,” “site optimization,” “Google visibility.” These are the “seeds” — the foundation for further expansion.
Step 2. Expansion using tools
For the Ukrainian market, the most effective combination is Google Search Console (shows queries your site already ranks for), tools like Serpstat or Ahrefs for competitor analysis, and Google suggestions (autocomplete). These suggestions are a direct signal from Google about what users are actively searching for right now. I never ignore them.
Step 3. Cleaning and clustering
This is the most time-consuming stage. You need to remove irrelevant queries, duplicates, and competitor brand queries, and then group similar keywords into clusters — groups that correspond to a single topic and can be targeted by one page. One cluster = one page or article. This essentially defines your website structure.
For example, queries like “SEO audit,” “conduct SEO audit,” “order SEO audit,” and “SEO audit cost” belong to one cluster. All of them should lead to a single service page optimized for the entire group.
💡 Practical tip: The easiest way to validate clustering is to search two queries in Google and compare the top results. If at least 60% of the results overlap, the queries belong to the same cluster.
What comes next after the semantic core?
A completed semantic core becomes the foundation for everything: website structure, content plan, copywriting briefs, and PPC campaign setup. Without it, all these processes are guesswork. With it, you clearly understand which page targets which queries and avoid internal competition between your own pages.
A semantic core is a time investment that pays off over months of consistent, structured work. Don’t rush to skip this step “to start promotion faster.” Without a solid semantic core, SEO is just moving in the dark. If you want to do it right and efficiently, I specialize in building and clustering semantic cores for different niches and would be happy to help with your project.
