burp vs pass off

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

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

As verbs, pass off is a hypernym of burp; that is, pass off is a word with a broader meaning than burp:

Other hypernyms of burp include breathe, emit.

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

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