boardroom vs council chamber

boardroom and council chamber both are nouns.

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

As nouns, boardroom and council chamber are synonyms defined as:

boardroom and council chamber: a room where a committee meets (such as the board of directors of a company)

boardroom (noun)	council chamber (noun)
a room where a committee meets (such as the board of directors of a company)	a room where a committee meets (such as the board of directors of a company)