brush off vs pass off

brush off and pass off both are verbs.

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

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

brush off (verb)	pass off (verb)
bar from attention or consideration	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