belief vs suspicion

belief and suspicion both are nouns.

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

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

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

belief (noun)	suspicion (noun)
any cognitive content held as true	being of a suspicious nature
a vague idea in which some confidence is placed	doubt about someone's honesty
	an impression that something might be the case
	the state of being suspected