diwan vs privy council

diwan and privy council both are nouns.

Word	Noun	Adjective	Verb	Adverb
diwan	Yes	No	No	No
privy council	Yes	No	No	No

As nouns, privy council is a hypernym of diwan; that is, privy council is a word with a broader meaning than diwan:

diwan: a Muslim council of state
privy council: an advisory council to a ruler (especially to the British Crown)

diwan (noun)	privy council (noun)
a Muslim council chamber or law court	an advisory council to a ruler (especially to the British Crown)
a collection of Persian or Arabic poems (usually by one author)
a Muslim council of state