iconoclasm vs heresy

iconoclasm and heresy both are nouns.

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

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

iconoclasm: the orientation of an iconoclast
heresy: any opinions or doctrines at variance with the official or orthodox position

Other hypernyms of iconoclasm include heterodoxy, unorthodoxy.

iconoclasm (noun)	heresy (noun)
the orientation of an iconoclast	a belief that rejects the orthodox tenets of a religion
	any opinions or doctrines at variance with the official or orthodox position