nonobservance vs nonconformity

nonobservance and nonconformity both are nouns.

Word	Noun	Adjective	Verb	Adverb
nonobservance	Yes	No	No	No
nonconformity	Yes	No	No	No

As nouns, nonconformity is a hypernym of nonobservance; that is, nonconformity is a word with a broader meaning than nonobservance:

Other hypernyms of nonobservance include nonconformance.

nonobservance (noun)	nonconformity (noun)
a lack of conformity with law or custom or practice etc.	failure to conform to accepted standards of behavior
	unorthodoxy as a consequence of not conforming to expected standards or values
	a lack of orthodoxy in thoughts or beliefs
	lack of harmony or correspondence