nastiness vs nasty

nastiness is a noun but nasty is not a noun.

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

nastiness (noun)	nasty (noun)
the quality of being highly unpleasant
malevolence by virtue of being malicious or spiteful or nasty
a state characterized by foul or disgusting dirt and refuse

nastiness (adjective)	nasty (adjective)
	offensive or even (of persons) malicious
	exasperatingly difficult to handle or circumvent
	disgustingly dirty; filled or smeared with offensive matter
	characterized by obscenity