ceremonial vs affair

ceremonial and affair both are nouns.

Word	Noun	Adjective	Verb	Adverb
ceremonial	Yes	Yes	No	No
affair	Yes	No	No	No

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

Other hypernyms of ceremonial include function, occasion, social affair, social function, social gathering, social occasion.

ceremonial (noun)	affair (noun)
a formal event performed on a special occasion	a vaguely specified concern
	a formal or official social gathering or ceremony of people
	a usually secretive or illicit sexual relationship

ceremonial (adjective)	affair (adjective)
marked by pomp or ceremony or formality