be sick vs vomit up

be sick and vomit up both are verbs.

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

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

be sick and vomit up: eject the contents of the stomach through the mouth

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

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