ContentPublished30.04.2026

Semantic Core (Keyword Universe)

The foundation of an SEO project: how to collect, clean, and cluster keywords to design the right site structure.

In brief

A semantic core is a structured set of all search queries that describe a website's topic. It is not just a word list but intent-grouped clusters that define the project's architecture and content.

Stages of building a semantic core

Creating the core is the first and critical step in an SEO project. Without it, you cannot design the structure or know which pages to create. Steps:

  1. Collection (Parsing) — gathering queries from Wordstat, Ahrefs, SEMrush, Google Suggest, and competitor analysis.
  2. Cleaning — removing off-target phrases (e.g., 'free download', 'DIY', location-irrelevant queries).
  3. Clustering — grouping queries by meaning and intent for mapping to future pages.

Query clustering

Modern SEO requires grouping queries so that each group becomes a dedicated landing page. Clusters are formed by meaning (soft clustering) and by SERP overlap (hard clustering). The goal is to prevent cannibalization and create strong, relevant pages.

Collection tools

  • Yandex Wordstat — basic collection for the Russian market.
  • SEMrush Keyword Magic Tool — the largest keyword database.
  • Ahrefs Keywords Explorer — competitor and difficulty analysis.
  • KeyCollector — a desktop parser for in-depth work.
  • Google Search Console — real queries already generating impressions.
FAQ

Common questions

A core is a structured system with intent groups and hierarchy. A list is just a flat collection without logical connections.
From a few hundred to hundreds of thousands, depending on the project scale. Coverage completeness matters more than raw numbers.
When launching new directions, adding products, or at least every six months to keep up with demand shifts.
Only on very small sites (under 10 pages). Otherwise, cannibalization and diluted relevance are highly likely.
Direct contacts

Discuss your project?

Share your goals and website context — I will suggest a practical next step.

[email protected]@pavelbarushkaLinkedIn