belching vs inborn reflex

belching and inborn reflex both are nouns.

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

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

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

belching (noun)	inborn 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