coca has 3 distinct synonyms spread across 2 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.
a South American shrub whose leaves are chewed by natives of the Andes; a source of cocaine
United States comedienne who starred in early television shows with Sid Caesar (1908-2001)
Synonyms, antonyms and the broader and narrower relations for coca come from Princeton University’s WordNet. Full sources and licences.
dried leaves of the coca plant (and related plants that also contain cocaine); chewed by Andean people for their stimulating effect