be sick vs throw up

be sick and throw up both are verbs.

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

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

be sick and throw 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, upchuck, vomit, vomit up.

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