stargazing vs observance

stargazing and observance both are nouns.

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

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

Other hypernyms of stargazing include observation, watching.

stargazing (noun)	observance (noun)
observation of the stars	the act of observing; taking a patient look
	conformity with law or custom or practice etc.
	the act of noticing or paying attention
	a formal event performed on a special occasion