smut has 13 distinct synonyms spread across 4 of its 9 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 black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink
destructive diseases of plants (especially cereal grasses) caused by fungi that produce black powdery masses of spores
creative activity (writing or pictures or films etc.) of no literary or artistic value other than to stimulate sexual desire
Synonyms, antonyms and the broader and narrower relations for smut come from Princeton University’s WordNet. Full sources and licences.
affect with smut or mildew, as of a crop such as corn