smuttiness vs obscenity

smuttiness and obscenity both are nouns.

Word	Noun	Adjective	Verb	Adverb
smuttiness	Yes	No	No	No
obscenity	Yes	No	No	No

As nouns, obscenity is a hypernym of smuttiness; that is, obscenity is a word with a broader meaning than smuttiness:

Other hypernyms of smuttiness include bawdiness, lewdness, salaciousness, salacity.

smuttiness (noun)	obscenity (noun)
obscenity in speech or writing	an obscene act
the state of being dirty with soot	the trait of behaving in an obscene manner
	an offensive or indecent word or phrase