shit vs bullshit

shit and bullshit both are nouns.

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

As nouns, shit and bullshit are synonyms defined as:

Other synonyms of shit include bull, crap, dogshit, horseshit, Irish bull.

shit (noun)	bullshit (noun)
something of little value	Obscene word for unacceptable behavior
Obscene word for unacceptable behavior
insulting terms of address for people who are stupid or irritating or ridiculous
a coarse term for defecation
a small worthless amount
obscene terms for feces

shit (verb)	bullshit (verb)
have a bowel movement	speak insincerely or without regard for facts or truths
give away information about somebody