flame-flower has 5 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.
a plant of the genus Kniphofia having long grasslike leaves and tall scapes of red or yellow drooping flowers
plant with fleshy roots and erect stems with narrow succulent leaves and one reddish-orange flower in each upper leaf axil; southwestern United States; Indians once cooked the fleshy roots
Synonyms, antonyms and the broader and narrower relations for flame-flower come from Princeton University’s WordNet. Full sources and licences.