pass off vs exhaust

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

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

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

Other hypernyms of pass off include discharge, eject, expel, release.

pass off (noun)	exhaust (noun)
	system consisting of the parts of an engine through which burned gases or steam are discharged
	gases ejected from an engine as waste products

pass off (verb)	exhaust (verb)
expel (gases or odors)	wear out completely
come to pass	eliminate (a substance)
disappear gradually	use up the whole supply of
disregard	use up (resources or materials)
cause to be circulated and accepted in a false character or identity	deplete
be accepted as something or somebody in a false character or identity