hysteria has 5 distinct synonyms spread across 2 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.
state of violent mental agitation
Synonyms, antonyms and the broader and narrower relations for hysteria come from Princeton University’s WordNet. Full sources and licences.
neurotic disorder characterized by violent emotional outbreaks and disturbances of sensory and motor functions