fall out vs effect

fall out is not a noun while effect is a noun.

Word	Noun	Adjective	Verb	Adverb
fall out	No	No	Yes	No
effect	Yes	No	Yes	No

fall out (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

fall out (verb)	effect (verb)
come to pass	produce
have a breach in relations	act so as to bring into existence
drop out
leave (a barracks) in order to take a place in a military formation, or leave a military formation
come as a logical consequence; follow logically