observance vs conformity

observance and conformity both are nouns.

Word	Noun	Adjective	Verb	Adverb
observance	Yes	No	No	No
conformity	Yes	No	No	No

As nouns, conformity is a hypernym of observance; that is, conformity is a word with a broader meaning than observance:

Other hypernyms of observance include abidance, compliance, conformation.

observance (noun)	conformity (noun)
the act of observing; taking a patient look	acting according to certain accepted standards
conformity with law or custom or practice etc.	hardened conventionality
the act of noticing or paying attention	correspondence in form or appearance
a formal event performed on a special occasion	orthodoxy in thoughts and belief
	concurrence of opinion