observance vs punctilio

observance and punctilio both are nouns.

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

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

observance (noun)	punctilio (noun)
the act of observing; taking a patient look	strict observance of formalities
conformity with law or custom or practice etc.	a fine point of etiquette or petty formality
the act of noticing or paying attention
a formal event performed on a special occasion