foulness vs nastiness

foulness and nastiness both are nouns.

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

As nouns, foulness and nastiness are synonyms defined as:

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

Other synonyms of foulness include filth, filthiness.

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