swamp oak has 6 distinct synonyms spread across 3 of its 3 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.
Australian leafless shrub resembling broom and having small yellow flowers
fast-growing medium to large pyramidal deciduous tree of northeastern United States and southeastern Canada having deeply pinnatifid leaves that turn bright red in autumn; thrives in damp soil
large deciduous oak of the eastern United States with a flaky bark and leaves that have fewer lobes than other white oaks; yields heavy strong wood used in construction; thrives in wet soil
Synonyms, antonyms and the broader and narrower relations for swamp oak come from Princeton University’s WordNet. Full sources and licences.