ceremonious vs formal

ceremonious is not a noun while formal is a noun.

Word	Noun	Adjective	Verb	Adverb
ceremonious	No	Yes	No	No
formal	Yes	Yes	No	No

ceremonious (noun)	formal (noun)
	a gown for evening wear
	a lavish dance requiring formal attire

ceremonious (adjective)	formal (adjective)
characterized by pomp and ceremony and stately display	being in accord with established forms and conventions and requirements (as e.g. of formal dress)
rigidly formal or bound by convention	(of spoken and written language) adhering to traditional standards of correctness and without casual, contracted, and colloquial forms
	refined or imposing in manner or appearance; befitting a royal court
	logically deductive
	represented in simplified or symbolic form
	characteristic of or befitting a person in authority