spanish dagger has 2 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.
yucca of southeastern United States similar to the Spanish bayonets but with shorter trunk and smoother leaves
arborescent yucca of southwestern United States and northern Mexico with sword-shaped leaves and white flowers
Synonyms, antonyms and the broader and narrower relations for spanish dagger come from Princeton University’s WordNet. Full sources and licences.