agency vs bureau

agency and bureau both are nouns.

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

As nouns, agency and bureau are synonyms defined as:

Other synonyms of agency include authority, federal agency, government agency, office.

agency (noun)	bureau (noun)
to have the ability to produce a particular effect or achieve an end	furniture with drawers for keeping clothes
an administrative unit of government	an administrative unit of government
a business or organization that provides a particular service, especially the mediation of transactions between two parties
the state of serving as an official and authorized delegate or agent
the state of being in action or exerting power