identify has 7 distinct synonyms spread across 3 of its 6 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.
recognize as being; establish the identity of someone or something
“She identified the man on the `wanted' poster”
consider (oneself) as similar to somebody else
“He identified with the refugees”
conceive of as united or associated
“Sex activity is closely identified with the hypothalamus”
Synonyms, antonyms and the broader and narrower relations for identify come from Princeton University’s WordNet. Full sources and licences.