crap vs guff

crap and guff both are nouns.

Word	Noun	Adjective	Verb	Adverb
crap	Yes	No	Yes	No
guff	Yes	No	No	No

As nouns, guff is a hypernym of crap; that is, guff is a word with a broader meaning than crap:

Other hypernyms of crap include buncombe, bunk, bunkum, hogwash, rot.

crap (noun)	guff (noun)
Obscene word for unacceptable behavior	unacceptable behavior (especially ludicrously false statements)
obscene terms for feces

crap (verb)	guff (verb)
have a bowel movement