dirtiness vs obscenity

dirtiness and obscenity both are nouns.

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

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

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

dirtiness (noun)	obscenity (noun)
obscenity in speech or writing	an obscene act
the state of being unsanitary	the trait of behaving in an obscene manner
the state of containing dirty impurities	an offensive or indecent word or phrase