anachronism has 2 distinct synonyms spread across 1 of its 3 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.
something located at a time when it could not have existed or occurred
an artifact that belongs to another time
Synonyms, antonyms and the broader and narrower relations for anachronism come from Princeton University’s WordNet. Full sources and licences.
a person who seems to be displaced in time; who belongs to another age