belief vs cognitive content

belief and cognitive content both are nouns.

Word	Noun	Adjective	Verb	Adverb
belief	Yes	No	No	No
cognitive content	Yes	No	No	No

As nouns, cognitive content is a hypernym of belief; that is, cognitive content is a word with a broader meaning than belief:

belief: any cognitive content held as true
cognitive content: the sum or range of what has been perceived, discovered, or learned

Other hypernyms of belief include content, mental object.

belief (noun)	cognitive content (noun)
any cognitive content held as true	the sum or range of what has been perceived, discovered, or learned
a vague idea in which some confidence is placed