semiofficial vs official

semiofficial is not a noun while official is a noun.

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

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

semiofficial (adjective)	official (adjective)
having some official authority or sanction	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