emesis vs regurgitation

emesis and regurgitation both are nouns.

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

As nouns, emesis and regurgitation are synonyms defined as:

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

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

emesis (noun)	regurgitation (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