burp vs physiological reaction

burp and physiological reaction both are nouns.

Word	Noun	Adjective	Verb	Adverb
burp	Yes	No	Yes	No
physiological reaction	Yes	No	No	No

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

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

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

burp (verb)	physiological reaction (verb)
expel gas from the stomach