flatus vs unconditioned reflex

flatus and unconditioned reflex both are nouns.

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

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

flatus: a reflex that expels intestinal gas through the anus
unconditioned reflex: an automatic instinctive unlearned reaction to a stimulus

flatus (noun)	unconditioned reflex (noun)
a reflex that expels intestinal gas through the anus	an automatic instinctive unlearned reaction to a stimulus