foulness vs filthiness

foulness and filthiness both are nouns.

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

As nouns, foulness and filthiness are synonyms defined as:

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

Other synonyms of foulness include filth, nastiness.

foulness (noun)	filthiness (noun)
the attribute of having a strong offensive smell	moral corruption or pollution
(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