beefwood has 7 distinct synonyms spread across 3 of its 5 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.
a tropical hardwood tree yielding balata gum and heavy red timber
any of several heavy hard reddish chiefly tropical woods of the families Casuarinaceae and Proteaceae; some used for cabinetwork
any of several Australian trees of the genus Casuarina yielding heavy hard red wood used in cabinetwork
tree or tall shrub with shiny leaves and umbels of fragrant creamy-white flowers; yields hard heavy reddish wood
Synonyms, antonyms and the broader and narrower relations for beefwood come from Princeton University’s WordNet. Full sources and licences.