throw up vs retch

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

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

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

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

throw up (noun)	retch (noun)
	an involuntary spasm of ineffectual vomiting

throw up (verb)	retch (verb)
eject the contents of the stomach through the mouth	eject the contents of the stomach through the mouth
	make an unsuccessful effort to vomit; strain to vomit