crud vs filth

crud and filth both are nouns.

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

As nouns, crud and filth are synonyms defined as:

crud and filth: any substance considered disgustingly foul or unpleasant

Other synonyms of crud include skank.

crud (noun)	filth (noun)
an ill-defined bodily ailment	an offensive or indecent word or phrase
any substance considered disgustingly foul or unpleasant	a state characterized by foul or disgusting dirt and refuse
heavy wet snow that is unsuitable for skiing	anything regarded as making something unclean
	any substance considered disgustingly foul or unpleasant