extraordinary vs great

extraordinary is not a noun while great is a noun.

Word	Noun	Adjective	Verb	Adverb
extraordinary	No	Yes	No	No
great	Yes	Yes	No	No

extraordinary (noun)	great (noun)
	a person who has achieved distinction and honor in some field

extraordinary (adjective)	great (adjective)
beyond what is ordinary or usual; highly unusual or exceptional or remarkable; special	excellent
far more than usual or expected	in an advanced stage of pregnancy
(of an official) serving an unusual or special function in addition to those of the regular officials	uppercase
	remarkable or out of the ordinary in degree or magnitude or effect
	of major significance or importance
	relatively large in size or number or extent; larger than others of its kind