ARDA vs bureau

ARDA and bureau both are nouns.

Word	Noun	Adjective	Verb	Adverb
ARDA	Yes	No	No	No
bureau	Yes	No	No	No

As nouns, bureau is a hypernym of ARDA; that is, bureau is a word with a broader meaning than ARDA:

ARDA: an agency of the Intelligence Community that conducts advanced research and development related to information technology
bureau: an administrative unit of government

Other hypernyms of ARDA include agency, authority, federal agency, government agency, office.

ARDA (noun)	bureau (noun)
an agency of the Intelligence Community that conducts advanced research and development related to information technology	furniture with drawers for keeping clothes
	an administrative unit of government