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Grouping comes from WordNet's own classification of every sense, not from a keyword match, so the answer is checkable rather than a matter of taste.
Odd one out is a free word game with 18 rounds. Each round shows 4 English words: three whose every sense WordNet files under one subject — animals, food, verbs of thinking — and one filed somewhere else. Picking the intruder reveals the field all four belong to, named in plain English, and the 348 words the game draws on are only ever words with a single field to their name.
Three of these four share a semantic field. Pick the one that does not.
Three of these four share a semantic field. Pick the one that does not.
Tab to move between the four, Enter or Space to choose. Keys 1 to 4 work too.
Read all four words. Three of them belong to one semantic field — animals, made things, verbs of speaking — and one does not.
Pick the intruder: click it, press its number key, or Tab to it and press Enter.
The round settles on your first choice. There is no second guess.
Read the reveal. Every one of the four words is named with the field WordNet filed it under and the definition that put it there, so a round you lost is a round you can check.
Any of the four words opens its full dictionary entry, with the rest of its senses and its relations.
Every round is in the page when it loads. Nothing is fetched between rounds, so the game behaves the same on a slow connection as on a fast one, and keeps working with the network switched off.
Candidates come from the 26 subject collections that are each built from one WordNet lexicographer file. Words in commonness band 3 or higher, four to twelve letters, with a definition that reads whole and does not contain the word it defines, give 3,754 entries to check.
Each of those is then read in full, because the rule this game turns on cannot be checked from a single definition: every sense of the word must sit in the same file, and at least one sense must carry a tag from WordNet’s hand-annotated corpus — the test that keeps proper names with a common spelling out of a vocabulary game. 348 words survive both, spread across 25 files, of which 19 hold enough words to host a round.
A round takes three words from one file and one from another file of the same part of speech, skipping pairings a reader would rightly argue with — a jury and a lawyer differ only by WordNet’s filing convention, so groups and people are never set against each other. Which file hosts which round, which word is the intruder and which slot it lands in are all fixed by hashing slugs, so the 18 rounds are identical on every build.
The words, definitions and semantic fields in this game come from Princeton University’s WordNet. Commonness bands are measured against a corpus of everyday English. Full sources and licences.