Marcionism vs heresy

Marcionism and heresy both are nouns.

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

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

Marcionism: the Christian heresy of the 2nd and 3rd centuries that rejected the Old Testament and denied the incarnation of God in Jesus as a human
heresy: a belief that rejects the orthodox tenets of a religion

Other hypernyms of Marcionism include unorthodoxy, theological doctrine.

Marcionism (noun)	heresy (noun)
the Christian heresy of the 2nd and 3rd centuries that rejected the Old Testament and denied the incarnation of God in Jesus as a human	a belief that rejects the orthodox tenets of a religion
	any opinions or doctrines at variance with the official or orthodox position