polity vs regime

polity and regime both are nouns.

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

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

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

Other hyponyms of polity include authorities, government.

polity (noun)	regime (noun)
shrewd or crafty management of public affairs	(medicine) a systematic plan for therapy (often including diet)
a politically organized unit	the organization that is the governing authority of a political unit
the form of government of a social organization