emesis vs vomiting

emesis and vomiting both are nouns.

Word	Noun	Adjective	Verb	Adverb
emesis	Yes	No	No	No
vomiting	Yes	No	No	No

As nouns, emesis and vomiting are synonyms defined as:

emesis and vomiting: the reflex act of ejecting the contents of the stomach through the mouth

Other synonyms of emesis include disgorgement, puking, regurgitation, vomit.

emesis (noun)	vomiting (noun)
the reflex act of ejecting the contents of the stomach through the mouth	the reflex act of ejecting the contents of the stomach through the mouth