fall out vs pass off

fall out and pass off both are verbs.

Word	Noun	Adjective	Verb	Adverb
fall out	No	No	Yes	No
pass off	No	No	Yes	No

As verbs, fall out and pass off are synonyms defined as:

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

fall out (verb)	pass off (verb)
come to pass	expel (gases or odors)
have a breach in relations	come to pass
drop out	disappear gradually
leave (a barracks) in order to take a place in a military formation, or leave a military formation	disregard
come as a logical consequence; follow logically	cause to be circulated and accepted in a false character or identity
	be accepted as something or somebody in a false character or identity