ceremonial vs ceremony

ceremonial and ceremony both are nouns.

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

As nouns, ceremonial and ceremony are synonyms defined as:

Other synonyms of ceremonial include ceremonial occasion, observance.

ceremonial (noun)	ceremony (noun)
a formal event performed on a special occasion	the proper or conventional behavior on some solemn occasion
	any activity that is performed in an especially solemn elaborate or formal way
	a formal event performed on a special occasion

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