occur vs pass off

occur and pass off both are verbs.

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

As verbs, occur and pass off are synonyms defined as:

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

occur (verb)	pass off (verb)
come to pass	expel (gases or odors)
come to one's mind; suggest itself	come to pass
to be found to exist	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