nub vs cognitive content

nub and cognitive content both are nouns.

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

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

nub: the choicest or most essential or most vital part of some idea or experience
cognitive content: the sum or range of what has been perceived, discovered, or learned

Other hypernyms of nub include content, mental object.

nub (noun)	cognitive content (noun)
the choicest or most essential or most vital part of some idea or experience	the sum or range of what has been perceived, discovered, or learned
a small piece
a small lump or protuberance