calypso has 2 distinct synonyms spread across 1 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.
rare north temperate bog orchid bearing a solitary white to pink flower marked with purple at the tip of an erect reddish stalk above 1 basal leaf
(Greek mythology) the sea nymph who detained Odysseus for seven years
Synonyms, antonyms and the broader and narrower relations for calypso come from Princeton University’s WordNet. Full sources and licences.