smut vs loose smut

smut and loose smut both are nouns.

Word	Noun	Adjective	Verb	Adverb
smut	Yes	No	Yes	No
loose smut	Yes	No	No	No

As nouns, loose smut is a hyponym of smut; that is, loose smut is a word with a more specific, narrower meaning than smut:

smut: any fungus of the order Ustilaginales
loose smut: a smut fungus of the genus Ustilago causing a smut disease of grains in which the entire head is transformed into a dusty mass of spores

As nouns, loose smut is a hyponym of smut; that is, loose smut is a word with a more specific, narrower meaning than smut:

smut: destructive diseases of plants (especially cereal grasses) caused by fungi that produce black powdery masses of spores
loose smut: disease of grains; the entire head is a dusty mass of spores

Other hyponyms of smut include bunt, stinking smut, flag smut, false smut, green smut.

smut (noun)	loose smut (noun)
creative activity (writing or pictures or films etc.) of no literary or artistic value other than to stimulate sexual desire	a smut fungus of the genus Ustilago causing a smut disease of grains in which the entire head is transformed into a dusty mass of spores
an offensive or indecent word or phrase	disease of grains; the entire head is a dusty mass of spores
any fungus of the order Ustilaginales
destructive diseases of plants (especially cereal grasses) caused by fungi that produce black powdery masses of spores
a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink

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