belch vs belching

belch and belching both are nouns.

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

As nouns, belch and belching are synonyms defined as:

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

Other synonyms of belch include burp, burping, eructation.

belch (noun)	belching (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

belch (verb)	belching (verb)
expel gas from the stomach
become active and spew forth lava and rocks