rot has 13 distinct synonyms spread across 5 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.
a state of decay usually accompanied by an offensive odor
(biology) the process of decay caused by bacterial or fungal action
become physically weaker
Synonyms, antonyms and the broader and narrower relations for rot come from Princeton University’s WordNet. Full sources and licences.
“Political prisoners are wasting away in many prisons all over the world”