belching vs burp

belching and burp both are nouns.

Word	Noun	Adjective	Verb	Adverb
belching	Yes	No	No	No
burp	Yes	No	Yes	No

As nouns, belching and burp are synonyms defined as:

belching and burp: a reflex that expels gas noisily from the stomach through the mouth

Other synonyms of belching include belch, burping, eructation.

belching (noun)	burp (noun)
a reflex that expels gas noisily from the stomach through the mouth	a reflex that expels gas noisily from the stomach through the mouth
the forceful expulsion of something from inside

belching (verb)	burp (verb)
	expel gas from the stomach