nastiness vs unsanitariness

nastiness and unsanitariness both are nouns.

Word	Noun	Adjective	Verb	Adverb
nastiness	Yes	No	No	No
unsanitariness	Yes	No	No	No

As nouns, unsanitariness is a hypernym of nastiness; that is, unsanitariness is a word with a broader meaning than nastiness:

nastiness (noun)	unsanitariness (noun)
the quality of being highly unpleasant	a state that is not conducive to health
malevolence by virtue of being malicious or spiteful or nasty
a state characterized by foul or disgusting dirt and refuse