throw up vs barf

throw up is not a noun while barf is a noun.

Word	Noun	Adjective	Verb	Adverb
throw up	No	No	Yes	No
barf	Yes	No	Yes	No

As verbs, throw up and barf are synonyms defined as:

Other synonyms of throw up include be sick, cast, cat, chuck, disgorge, honk, puke, purge, regorge, regurgitate, retch, sick, spew, spue, upchuck, vomit, vomit up.

throw up (noun)	barf (noun)
	the matter ejected in vomiting

throw up (verb)	barf (verb)
eject the contents of the stomach through the mouth	eject the contents of the stomach through the mouth