vitriol has 5 distinct synonyms spread across 2 of its 4 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.
(H2SO4) a highly corrosive acid made from sulfur dioxide; widely used in the chemical industry
abusive or venomous language used to express blame or censure or bitter deep-seated ill will
expose to the effects of vitriol or injure with vitriol
Synonyms, antonyms and the broader and narrower relations for vitriol come from Princeton University’s WordNet. Full sources and licences.