fugue has 1 distinct synonym 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.
dissociative disorder in which a person forgets who they are and leaves home to create a new life; during the fugue there is no memory of the former life; after recovering there is no memory for events during the dissociative state
a dreamlike state of altered consciousness that may last for hours or days
a musical form consisting of a theme repeated a fifth above or a fourth below its first statement
Synonyms, antonyms and the broader and narrower relations for fugue come from Princeton University’s WordNet. Full sources and licences.