rehabilitate has no recorded synonym. 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. Its one recorded opposite is purge.
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.
help to readapt, as to a former state of health or good repute
“The prisoner was successfully rehabilitated”
reinstall politically
“Deng Xiao Ping was rehabilitated several times throughout his lifetime”
Synonyms, antonyms and the broader and narrower relations for rehabilitate come from Princeton University’s WordNet. Full sources and licences.
restore to a state of good condition or operation