vomiting vs emesis

vomiting and emesis both are nouns.

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

As nouns, vomiting and emesis are synonyms defined as:

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

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

vomiting (noun)	emesis (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