Ontology & Taxonomy Search Engine

Search 73,261 categories in 6 lists at once

six category lists · 73,261 categories

This page puts six category lists side by side: Google Ads, ChatGPT V1, Google place types, Overture, Shopify and NAICS 2022. Together they hold 73,261 categories. Search them all at once, open any list as a tree on its own page, and see where the same name appears in more than one list.

Lists
6
Categories
73,261
Same name
2,180categories whose name is in another list
Similar name
243in another list, and no same name there
Google list checked
November 10, 2026Google's file matched this copy

The lists

Each list has its own page with its full tree, its source and its license as the publisher states it.

How much do the lists overlap?

Pick any three lists, or see all 6 at once. Each count is a number of distinct category names; press it to see the names, each linked to its category on its list's page.

Google: blueChatGPT V1: greenOverture: pinkShopify: yellowNAICS: grey

View
Match by
ChatGPT V1Google AdsGoogle place types

Circles are not drawn to scale.

Same name: the two names are equal after lowercasing, trimming spaces at both ends and reading _ as a space. Counts are distinct names: names that become equal under this rule count once.

In all three lists: 1 name

Same name: the two names are equal after lowercasing, trimming spaces at both ends and reading _ as a space.

What is each kind of list for?

Each list says what it is for in its own words, quoted here.

Products

Shopify Standard Product Taxonomy. Shopify calls its taxonomy “a universal language that empowers merchants to categorize their products.” Open the list

Business categories

ChatGPT V1 categories. OpenAI announced Businesses in ChatGPT on 10 November 2026 but has not published this category list. This page is a snapshot of the list in ChatGPT's business hub web app, read on 11 November 2026, and it may change. "V1" is this site's label. The file's own note: “Bundled categories are not necessarily selectable or eligible for all accounts.” Open the list

How are names matched across lists?

  • Same name: the two names are equal after lowercasing, trimming spaces at both ends and reading _ as a space.
  • Similar name: the two names are equal after lowercasing, trimming spaces at both ends, reading _ as a space, writing & as and, and dropping from either name a final s that does not follow another s, or a final es after s, x, z, ch or sh.
  • A list is named under “Similar name in” only when it has no category with the same name. Table headings, group headings, areas and families are structure, not categories, and are not matched.
  • Names are compared by these two rules only, word for word as each publisher writes them: no translation, no fuzzy matching and no AI matching. A shared name is a shared name, not a claim that the two categories mean the same thing.