royal court vs Porte

royal court and Porte both are nouns.

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

As nouns, Porte is a hyponym of royal court; that is, Porte is a word with a more specific, narrower meaning than royal court:

royal court: the sovereign and his advisers who are the governing power of a state
Porte: the Ottoman court in Constantinople

Other hyponyms of royal court include Court of Saint James's, Sublime Porte.

royal court (noun)	Porte (noun)
the sovereign and his advisers who are the governing power of a state	the Ottoman court in Constantinople
the family and retinue of a sovereign or prince