rehabilitation has 2 distinct synonyms spread across 1 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.
the restoration of someone to a useful place in society
the conversion of wasteland into land suitable for use of habitation or cultivation
Synonyms, antonyms and the broader and narrower relations for rehabilitation come from Princeton University’s WordNet. Full sources and licences.
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.
vindication of a person's character and the re-establishment of that person's reputation
the treatment of physical disabilities by massage and electrotherapy and exercises