official vs adjudicator

official and adjudicator both are nouns.

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

As nouns, adjudicator is a hypernym of official; that is, adjudicator is a word with a broader meaning than official:

official (noun)	adjudicator (noun)
someone who administers the rules of a game or sport	a person who studies and settles conflicts and disputes
a worker who holds or is invested with an office

official (adjective)	adjudicator (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