official vs unofficial

official is a noun but unofficial is not a noun.

Word	Noun	Adjective	Verb	Adverb
official	Yes	Yes	No	No
unofficial	No	Yes	No	No

official (noun)	unofficial (noun)
someone who administers the rules of a game or sport
a worker who holds or is invested with an office

official (adjective)	unofficial (adjective)
having official authority or sanction	not having official authority or sanction
of or relating to an office	not officially established
verified officially
(of a church) given official status as a national or state institution
conforming to set usage, procedure, or discipline