flame tree has 20 distinct synonyms spread across 5 of its 5 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 terrestrial evergreen shrub or small tree of western Australia having brilliant yellow-orange flowers; parasitic on roots of grasses
showy tropical tree or shrub native to Madagascar; widely planted in tropical regions for its immense racemes of scarlet and orange flowers; sometimes placed in genus Poinciana
north Australian tree having white flowers and broad leaves
south Australian tree having panicles of brilliant scarlet flowers
tropical American thorny shrub or small tree; fragrant yellow flowers used in making perfumery
Synonyms, antonyms and the broader and narrower relations for flame tree come from Princeton University’s WordNet. Full sources and licences.