WordNet sense 1 (a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink):

crock, lampblack, soot, carbon black

WordNet sense 2 (any fungus of the order Ustilaginales):

smut fungus

WordNet sense 3 (an offensive or indecent word or phrase):

filth, obscenity, vulgarism, dirty word

WordNet sense 4 (creative activity (writing or pictures or films etc.) of no literary or artistic value other than to stimulate sexual desire):

erotica, porno, pornography