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rust has 6 distinct synonyms spread across 5 of its 8 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 red or brown oxide coating on iron or steel caused by the action of oxygen and moisture
a plant disease that produces a reddish-brown discoloration of leaves and stems; caused by various rust fungi
Synonyms, antonyms and the broader and narrower relations for rust come from Princeton University’s WordNet. Full sources and licences.
of the brown color of rust