guff vs bullshit

guff and bullshit both are nouns.

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

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

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

guff (noun)	bullshit (noun)
unacceptable behavior (especially ludicrously false statements)	Obscene word for unacceptable behavior

guff (verb)	bullshit (verb)
	speak insincerely or without regard for facts or truths