pass off vs burp

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

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

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

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

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

pass off (verb)	burp (verb)
expel (gases or odors)	expel gas from the stomach
come to pass
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