belching vs innate reflex

belching and innate reflex both are nouns.

Word	Noun	Adjective	Verb	Adverb
belching	Yes	No	No	No
innate reflex	Yes	No	No	No

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

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

belching (noun)	innate reflex (noun)
a reflex that expels gas noisily from the stomach through the mouth	an automatic instinctive unlearned reaction to a stimulus
the forceful expulsion of something from inside