pageant vs ceremonial occasion

pageant and ceremonial occasion both are nouns.

Word	Noun	Adjective	Verb	Adverb
pageant	Yes	No	No	No
ceremonial occasion	Yes	No	No	No

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

Other hypernyms of pageant include ceremonial, ceremony, observance.

pageant (noun)	ceremonial occasion (noun)
an elaborate representation of scenes from history etc; usually involves a parade with rich costumes	a formal event performed on a special occasion
a rich and spectacular ceremony