obscenity vs impropriety

obscenity and impropriety both are nouns.

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

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

Other hypernyms of obscenity include indecency.

obscenity (noun)	impropriety (noun)
an obscene act	an act of undue intimacy
the trait of behaving in an obscene manner	an indecent or improper act
an offensive or indecent word or phrase	an improper demeanor
	the condition of being improper