cognitive content vs mental object

cognitive content and mental object both are nouns.

Word	Noun	Adjective	Verb	Adverb
cognitive content	Yes	No	No	No
mental object	Yes	No	No	No

As nouns, cognitive content and mental object are synonyms defined as:

cognitive content and mental object: the sum or range of what has been perceived, discovered, or learned

Other synonyms of cognitive content include content.

cognitive content (noun)	mental object (noun)
the sum or range of what has been perceived, discovered, or learned	the sum or range of what has been perceived, discovered, or learned