red gum has 14 distinct synonyms spread across 5 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.
reddish-brown dried gummy exudation from any of several trees of the genus Eucalyptus especially Eucalyptus camaldulensis
red gum tree of Tasmania
reddish-brown wood and lumber from heartwood of the sweet gum tree used to make furniture
a North American tree of the genus Liquidambar having prickly spherical fruit clusters and fragrant sap
Synonyms, antonyms and the broader and narrower relations for red gum come from Princeton University’s WordNet. Full sources and licences.