smut - noun

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

any fungus of the order Ustilaginales

an offensive or indecent word or phrase

smut - verb

• make obscene
• stain with a dirty substance, such as soot
• become affected with smut
• affect with smut or mildew, as of a crop such as corn

smut - thesaurus

crock   filth   lampblack   obscenity   soot   vulgarism