Synonyms for Retch (same or very similar meaning)
WordNet sense 1 (an involuntary spasm of ineffectual vomiting):
heaveWordNet sense 2 (make an unsuccessful effort to vomit; strain to vomit):
gagWordNet sense 3 (eject the contents of the stomach through the mouth):
barf, cast, cat, chuck, disgorge, honk, puke, purge, regurgitate, sick, spew, upchuck, vomit, regorge, spue, be sick, throw up, vomit upFrom the ODE community, based on WordNetadd/edit