tantra has 1 distinct synonym 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.
any of a fairly recent class of Hindu or Buddhist religious literature concerned with ritual acts of body and speech and mind
Synonyms, antonyms and the broader and narrower relations for tantra come from Princeton University’s WordNet. Full sources and licences.