royal court vs regime

royal court and regime both are nouns.

Word	Noun	Adjective	Verb	Adverb
royal court	Yes	No	No	No
regime	Yes	No	No	No

As nouns, regime is a hypernym of royal court; that is, regime is a word with a broader meaning than royal court:

royal court: the sovereign and his advisers who are the governing power of a state
regime: the organization that is the governing authority of a political unit

Other hypernyms of royal court include authorities, government.

royal court (noun)	regime (noun)
the sovereign and his advisers who are the governing power of a state	(medicine) a systematic plan for therapy (often including diet)
the family and retinue of a sovereign or prince	the organization that is the governing authority of a political unit