come off vs pass off

come off and pass off both are verbs.

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

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

Other hypernyms of come off include come about, fall out, go on, hap, happen, occur, pass, take place.

come off (verb)	pass off (verb)
happen in a particular manner	expel (gases or odors)
come to be detached	come to pass
break off (a piece from a whole)	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