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acid has 24 distinct synonyms spread across 3 of its 5 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.
harsh or corrosive in tone
“an acerbic tone piercing otherwise flowery prose”
any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
1 of the 5 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for acid.
Synonyms, antonyms and the broader and narrower relations for acid come from Princeton University’s WordNet. Full sources and licences.