bureau vs authority

bureau and authority both are nouns.

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

As nouns, bureau and authority are synonyms defined as:

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

bureau (noun)	authority (noun)
furniture with drawers for keeping clothes	the power or right to give orders or make decisions
an administrative unit of government	official permission or approval
	freedom from doubt; belief in yourself and your abilities
	an authoritative written work
	an administrative unit of government
	an expert whose views are taken as definitive
	(usually plural) persons who exercise (administrative) control over others