sick vs vomit up

sick is a noun but vomit up is not a noun.

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

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

sick (noun)	vomit up (noun)
people who are sick

sick (adjective)	vomit up (adjective)
affected by an impairment of normal physical or mental function
shockingly repellent; inspiring horror
having a strong distaste from surfeit
affected with madness or insanity
deeply affected by a strong feeling
(of light) lacking in intensity or brightness; dim or feeble
feeling nausea; feeling about to vomit

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