observance vs conformation

observance and conformation both are nouns.

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

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

Other hypernyms of observance include abidance, compliance, conformity.

observance (noun)	conformation (noun)
the act of observing; taking a patient look	acting according to certain accepted standards
conformity with law or custom or practice etc.	any spatial attributes (especially as defined by outline)
the act of noticing or paying attention	a symmetrical arrangement of the parts of a thing
a formal event performed on a special occasion