observance vs compliance

observance and compliance both are nouns.

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

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

Other hypernyms of observance include abidance, conformation, conformity.

observance (noun)	compliance (noun)
the act of observing; taking a patient look	the act of submitting; usually surrendering power to another
conformity with law or custom or practice etc.	acting according to certain accepted standards
the act of noticing or paying attention	a disposition or tendency to yield to the will of others
a formal event performed on a special occasion