burp vs unconditioned reflex

burp and unconditioned reflex both are nouns.

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

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

burp: a reflex that expels gas noisily from the stomach through the mouth
unconditioned reflex: an automatic instinctive unlearned reaction to a stimulus

burp (noun)	unconditioned reflex (noun)
a reflex that expels gas noisily from the stomach through the mouth	an automatic instinctive unlearned reaction to a stimulus

burp (verb)	unconditioned reflex (verb)
expel gas from the stomach