Synonyms for smut

a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink (noun)

• lampblack
• soot
• crock

any fungus of the order Ustilaginales (noun)

an offensive or indecent word or phrase (noun)

• obscenity
• vulgarism
• filth

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

• pornography
• porno
• porn
• erotica