authority vs evaluator

authority and evaluator both are nouns.

Word	Noun	Adjective	Verb	Adverb
authority	Yes	No	No	No
evaluator	Yes	No	No	No

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

authority (noun)	evaluator (noun)
the power or right to give orders or make decisions	an authority who is able to estimate worth or quality
official permission or approval
freedom from doubt; belief in yourself and your abilities
an authoritative written work
an administrative unit of government
an expert whose views are taken as definitive
(usually plural) persons who exercise (administrative) control over others