retch vs regurgitate

retch is a noun but regurgitate is not a noun.

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

As verbs, retch and regurgitate are synonyms defined as:

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

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

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

retch (verb)	regurgitate (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	repeat after memorization
	feed through the beak by regurgitating previously swallowed food
	pour or rush back