pass off vs occur

pass off and occur both are verbs.

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

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

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

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