emesis vs reflex response

emesis and reflex response both are nouns.

Word	Noun	Adjective	Verb	Adverb
emesis	Yes	No	No	No
reflex response	Yes	No	No	No

As nouns, reflex response is a hypernym of emesis; that is, reflex response is a word with a broader meaning than emesis:

emesis: the reflex act of ejecting the contents of the stomach through the mouth
reflex response: an automatic instinctive unlearned reaction to a stimulus

emesis (noun)	reflex response (noun)
the reflex act of ejecting the contents of the stomach through the mouth	an automatic instinctive unlearned reaction to a stimulus