tag has 15 distinct synonyms spread across 4 of its 10 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a label associated with something for the purpose of identification
“semantic tags were attached in order to identify different meanings of the word”
a small piece of cloth or paper
a game in which one child chases the others; the one who is caught becomes the next chaser
(sports) the act of touching a player in a game (which changes their status in the game)
Synonyms, antonyms and the broader and narrower relations for tag come from Princeton University’s WordNet. Full sources and licences.
supply (blank verse or prose) with rhymes