ex officio vs official

ex officio is not a noun while official is a noun.

Word	Noun	Adjective	Verb	Adverb
ex officio	No	Yes	No	Yes
official	Yes	Yes	No	No

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

ex officio (adjective)	official (adjective)
by virtue of an office or position	having official authority or sanction
	of or relating to an office
	verified officially
	(of a church) given official status as a national or state institution
	conforming to set usage, procedure, or discipline

ex officio (adverb)	official (adverb)
by virtue of position