gangrene has 7 distinct synonyms spread across 3 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.
necrotic tissue; a mortified or gangrenous part or mass
the localized death of living cells (as from infection or the interruption of blood supply)
undergo necrosis
“the tissue around the wound necrosed”
Synonyms, antonyms and the broader and narrower relations for gangrene come from Princeton University’s WordNet. Full sources and licences.