vomit

[1]	spew out/up , spit up , belch forth , regurgitate , throw up , gag , retch , heave , (US) keck , (Colloq) puke , return (food) , (Brit) sick up , (Slang) (Mainly Australian) chunder , (US) barf , upchuck , toss (one's) cookies , spiff (one's) biscuits
[2]	vomit up , purge , cast , sick , cat , be sick , disgorge , regorge , retch , puke , barf , spew , spue , chuck , upchuck , honk , regurgitate , throw up

[1]	vomitus , puke , barf
[2]	emetic , vomitive , nauseant
[3]	vomiting , emesis , regurgitation , disgorgement , puking