heresy vs iconoclasm

heresy and iconoclasm both are nouns.

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

As nouns, iconoclasm is a hyponym of heresy; that is, iconoclasm is a word with a more specific, narrower meaning than heresy:

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

Other hyponyms of heresy include nonconformance, nonconformism, nonconformity.

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