recuperate has 4 distinct synonyms spread across 3 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. Its one recorded opposite is deteriorate.
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.
restore to good health or strength
get over an illness or shock
“The patient is recuperating”
Synonyms, antonyms and the broader and narrower relations for recuperate come from Princeton University’s WordNet. Full sources and licences.