diwan vs council chamber

diwan and council chamber both are nouns.

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

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

diwan: a Muslim council chamber or law court
council chamber: a room where a committee meets (such as the board of directors of a company)

Other hypernyms of diwan include boardroom, chamber.

diwan (noun)	council chamber (noun)
a Muslim council chamber or law court	a room where a committee meets (such as the board of directors of a company)
a collection of Persian or Arabic poems (usually by one author)
a Muslim council of state