ignorance vs mental object

ignorance and mental object both are nouns.

Word	Noun	Adjective	Verb	Adverb
ignorance	Yes	No	No	No
mental object	Yes	No	No	No

As nouns, mental object is a hypernym of ignorance; that is, mental object is a word with a broader meaning than ignorance:

ignorance: the lack of knowledge or education
mental object: the sum or range of what has been perceived, discovered, or learned

Other hypernyms of ignorance include cognitive content, content.

ignorance (noun)	mental object (noun)
the lack of knowledge or education	the sum or range of what has been perceived, discovered, or learned