regurgitate vs retch

regurgitate is not a noun while retch is a noun.

Word	Noun	Adjective	Verb	Adverb
regurgitate	No	No	Yes	No
retch	Yes	No	Yes	No

As verbs, regurgitate and retch are synonyms defined as:

regurgitate and retch: eject the contents of the stomach through the mouth

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

regurgitate (noun)	retch (noun)
	an involuntary spasm of ineffectual vomiting

regurgitate (verb)	retch (verb)
eject the contents of the stomach through the mouth	eject the contents of the stomach through the mouth
repeat after memorization	make an unsuccessful effort to vomit; strain to vomit
feed through the beak by regurgitating previously swallowed food
pour or rush back