pass off vs go away

pass off and go away both are verbs.

Word	Noun	Adjective	Verb	Adverb
pass off	No	No	Yes	No
go away	No	No	Yes	No

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

Other hypernyms of pass off include disappear, vanish.

pass off (verb)	go away (verb)
expel (gases or odors)	get lost, as without warning or explanation
come to pass	go away from a place
disappear gradually	move away from a place into another direction
disregard	become invisible or unnoticeable
cause to be circulated and accepted in a false character or identity
be accepted as something or somebody in a false character or identity