filth vs foulness

filth and foulness both are nouns.

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

As nouns, filth and foulness are synonyms defined as:

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

Other synonyms of filth include filthiness, nastiness.

filth (noun)	foulness (noun)
an offensive or indecent word or phrase	the attribute of having a strong offensive smell
a state characterized by foul or disgusting dirt and refuse	(of weather) the badness of the weather
anything regarded as making something unclean	a state characterized by foul or disgusting dirt and refuse
any substance considered disgustingly foul or unpleasant	disgusting wickedness and immorality