regurgitation vs emesis

regurgitation and emesis both are nouns.

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

As nouns, regurgitation and emesis are synonyms defined as:

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

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

regurgitation (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
recall after rote memorization
backflow of blood through a defective heart valve