leather flower has 4 distinct synonyms spread across 2 of its 2 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.
scandent subshrub of southeastern United States having large red-purple bell-shaped flowers with leathery recurved sepals
woody vine of the southern United States having purple or blue flowers with leathery recurved sepals
Synonyms, antonyms and the broader and narrower relations for leather flower come from Princeton University’s WordNet. Full sources and licences.