official vs umpire

official and umpire both are nouns.

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

As nouns, umpire is a hyponym of official; that is, umpire is a word with a more specific, narrower meaning than official:

official (noun)	umpire (noun)
someone who administers the rules of a game or sport	an official at a baseball game
a worker who holds or is invested with an office	someone chosen to judge and decide a disputed issue

official (adjective)	umpire (adjective)
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

official (verb)	umpire (verb)
	be a referee or umpire in a sports competition