observance vs remark

observance and remark both are nouns.

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

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

Other hyponyms of observance include mind.

observance (noun)	remark (noun)
the act of observing; taking a patient look	explicit notice
conformity with law or custom or practice etc.	a statement that expresses a personal opinion or belief or adds information
the act of noticing or paying attention
a formal event performed on a special occasion

observance (verb)	remark (verb)
	make mention of
	make or write a comment on