emesis vs instinctive reflex

emesis and instinctive reflex both are nouns.

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

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

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

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