heresy vs mental object

heresy and mental object both are nouns.

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

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

heresy: a belief that rejects the orthodox tenets of a religion
mental object: the sum or range of what has been perceived, discovered, or learned

Other hypernyms of heresy include cognitive content, content.

heresy (noun)	mental object (noun)
a belief that rejects the orthodox tenets of a religion	the sum or range of what has been perceived, discovered, or learned
any opinions or doctrines at variance with the official or orthodox position