salve has 7 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.
semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation
anything that remedies or heals or soothes
“he needed a salve for his conscience”
apply a salve to, usually for the purpose of healing
Synonyms, antonyms and the broader and narrower relations for salve come from Princeton University’s WordNet. Full sources and licences.