vomit up vs vomit

vomit up is not a noun while vomit is a noun.

Word	Noun	Adjective	Verb	Adverb
vomit up	No	No	Yes	No
vomit	Yes	No	Yes	No

As verbs, vomit up and vomit are synonyms defined as:

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

vomit up (noun)	vomit (noun)
	the reflex act of ejecting the contents of the stomach through the mouth
	a medicine that induces nausea and vomiting
	the matter ejected in vomiting

vomit up (verb)	vomit (verb)
eject the contents of the stomach through the mouth	eject the contents of the stomach through the mouth