filth vs crud

filth and crud both are nouns.

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

As nouns, filth and crud are synonyms defined as:

filth and crud: any substance considered disgustingly foul or unpleasant

Other synonyms of filth include skank.

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