pageant vs observance

pageant and observance both are nouns.

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

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

Other hypernyms of pageant include ceremonial, ceremonial occasion, ceremony.

pageant (noun)	observance (noun)
an elaborate representation of scenes from history etc; usually involves a parade with rich costumes	the act of observing; taking a patient look
a rich and spectacular ceremony	conformity with law or custom or practice etc.
	the act of noticing or paying attention
	a formal event performed on a special occasion