bladderpod has 2 distinct synonyms spread across 1 of its 4 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.
North American wild lobelia having small blue flowers and inflated capsules formerly used as an antispasmodic
annual or perennial herbs with inflated seed pods; some placed in genus Lesquerella
any of several plants of the genus Physaria having racemose yellow flowers and inflated pods
any of several hairy North American herbs having yellow racemose flowers and inflated pods
Synonyms, antonyms and the broader and narrower relations for bladderpod come from Princeton University’s WordNet. Full sources and licences.