extraordinary vs singular

extraordinary is not a noun while singular is a noun.

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

extraordinary (noun)	singular (noun)
	the form of a word that is used to denote a singleton

extraordinary (adjective)	singular (adjective)
beyond what is ordinary or usual; highly unusual or exceptional or remarkable; special	grammatical number category referring to a single item or unit
far more than usual or expected	composed of one member, set, or kind
(of an official) serving an unusual or special function in addition to those of the regular officials	unusual or striking
	being a single and separate person or thing
	the single one of its kind
	beyond or deviating from the usual or expected