authority vs plural form

authority and plural form both are nouns.

Word	Noun	Adjective	Verb	Adverb
authority	Yes	No	No	No
plural form	Yes	No	No	No

authority (noun)	plural form (noun)
the power or right to give orders or make decisions	the form of a word that is used to denote more than one
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