belief vs effect

belief and effect both are nouns.

Word	Noun	Adjective	Verb	Adverb
belief	Yes	No	No	No
effect	Yes	No	Yes	No

As nouns, effect is a hyponym of belief; that is, effect is a word with a more specific, narrower meaning than belief:

Other hyponyms of belief include presence, first blush, hunch, intuition, suspicion.

belief (noun)	effect (noun)
any cognitive content held as true	an outward appearance
a vague idea in which some confidence is placed	(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

belief (verb)	effect (verb)
	produce
	act so as to bring into existence