food vs cognitive content

food and cognitive content both are nouns.

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

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

food: anything that provides mental stimulus for thinking
cognitive content: the sum or range of what has been perceived, discovered, or learned

Other hypernyms of food include content, mental object.

food (noun)	cognitive content (noun)
any substance that can be metabolized by an animal to give energy and build tissue	the sum or range of what has been perceived, discovered, or learned
anything that provides mental stimulus for thinking
any solid substance (as opposed to liquid) that is used as a source of nourishment