leopard lily has 7 distinct synonyms spread across 3 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.
lily of western United States having orange-red to crimson maroon-spotted flowers
lily of southeastern United States having cup-shaped flowers with deep yellow to scarlet recurved petals
garden plant whose capsule discloses when ripe a mass of seeds resembling a blackberry
Synonyms, antonyms and the broader and narrower relations for leopard lily come from Princeton University’s WordNet. Full sources and licences.