exhaust vs pass off

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

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

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

exhaust (noun)	pass off (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

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