guff vs crap

guff and crap both are nouns.

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

As nouns, crap is a hyponym of guff; that is, crap is a word with a more specific, narrower meaning than guff:

Other hyponyms of guff include bull, bullshit, dogshit, horseshit, Irish bull, shit.

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

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