authority vs reprover

authority and reprover both are nouns.

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

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

authority: (usually plural) persons who exercise (administrative) control over others
reprover: someone who finds fault or imputes blame

authority (noun)	reprover (noun)
the power or right to give orders or make decisions	someone who finds fault or imputes blame
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