nastiness vs foulness

nastiness and foulness both are nouns.

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

As nouns, nastiness and foulness are synonyms defined as:

nastiness and foulness: a state characterized by foul or disgusting dirt and refuse

Other synonyms of nastiness include filth, filthiness.

nastiness (noun)	foulness (noun)
the quality of being highly unpleasant	the attribute of having a strong offensive smell
malevolence by virtue of being malicious or spiteful or nasty	(of weather) the badness of the weather
a state characterized by foul or disgusting dirt and refuse	a state characterized by foul or disgusting dirt and refuse
	disgusting wickedness and immorality