extraordinary vs one

extraordinary is not a noun while one is a noun.

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

extraordinary (noun)	one (noun)
	a single person or thing
	the smallest whole number or a numeral representing this number

extraordinary (adjective)	one (adjective)
beyond what is ordinary or usual; highly unusual or exceptional or remarkable; special	used of a single unit or thing; not two or more
far more than usual or expected	being a single entity made by combining separate components
(of an official) serving an unusual or special function in addition to those of the regular officials	(informal) very; used informally as an intensifier
	eminent beyond or above comparison
	indefinite in time or position
	of the same kind or quality
	having the indivisible character of a unit