authorities vs polity

authorities and polity both are nouns.

Word	Noun	Adjective	Verb	Adverb
authorities	Yes	No	No	No
polity	Yes	No	No	No

As nouns, polity is a hypernym of authorities; that is, polity is a word with a broader meaning than authorities:

authorities: the organization that is the governing authority of a political unit
polity: a politically organized unit

authorities (noun)	polity (noun)
the organization that is the governing authority of a political unit	shrewd or crafty management of public affairs
	a politically organized unit
	the form of government of a social organization