sneeze vs unconditioned reflex

sneeze and unconditioned reflex both are nouns.

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

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

sneeze: a symptom consisting of the involuntary expulsion of air from the nose
unconditioned reflex: an automatic instinctive unlearned reaction to a stimulus

sneeze (noun)	unconditioned reflex (noun)
a symptom consisting of the involuntary expulsion of air from the nose	an automatic instinctive unlearned reaction to a stimulus

sneeze (verb)	unconditioned reflex (verb)
exhale spasmodically, as when an irritant entered one's nose