belching vs instinctive reflex

belching and instinctive reflex both are nouns.

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

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

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

belching (noun)	instinctive 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