emesis vs unconditioned reflex

emesis and unconditioned reflex both are nouns.

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

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

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

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