heresy vs heterodoxy

heresy and heterodoxy both are nouns.

Word	Noun	Adjective	Verb	Adverb
heresy	Yes	No	No	No
heterodoxy	Yes	No	No	No

As nouns, heresy and heterodoxy are synonyms defined as:

heresy and heterodoxy: any opinions or doctrines at variance with the official or orthodox position

Other synonyms of heresy include unorthodoxy.

heresy (noun)	heterodoxy (noun)
a belief that rejects the orthodox tenets of a religion	the quality of being unorthodox
any opinions or doctrines at variance with the official or orthodox position	any opinions or doctrines at variance with the official or orthodox position