pass off vs effect

pass off is not a noun while effect is a noun.

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

pass off (noun)	effect (noun)
	an outward appearance
	(of a law) having legal validity
	an impression (especially one that is artificial or contrived)
	the central meaning or theme of a speech or literary work
	a phenomenon that follows and is caused by some previous phenomenon
	a symptom caused by an illness or a drug

pass off (verb)	effect (verb)
expel (gases or odors)	produce
come to pass	act so as to bring into existence
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