pass off vs belch

pass off is not a noun while belch is a noun.

Word	Noun	Adjective	Verb	Adverb
pass off	No	No	Yes	No
belch	Yes	No	Yes	No

As verbs, belch is a hyponym of pass off; that is, belch is a word with a more specific, narrower meaning than pass off:

Other hyponyms of pass off include bubble, burp, eruct, force out, emanate, exhale, give forth, radiate, bubble.

pass off (noun)	belch (noun)
	a reflex that expels gas noisily from the stomach through the mouth

pass off (verb)	belch (verb)
expel (gases or odors)	expel gas from the stomach
come to pass	become active and spew forth lava and rocks
disappear gradually
disregard
cause to be circulated and accepted in a false character or identity
be accepted as something or somebody in a false character or identity