Bureau of Customs vs authority

Bureau of Customs and authority both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bureau of Customs	Yes	No	No	No
authority	Yes	No	No	No

As nouns, authority is a hypernym of Bureau of Customs; that is, authority is a word with a broader meaning than Bureau of Customs:

Bureau of Customs: the agency of the Treasury Department that enforces import tariffs
authority: an administrative unit of government

Other hypernyms of Bureau of Customs include agency, bureau, federal agency, government agency, office.

Bureau of Customs (noun)	authority (noun)
the agency of the Treasury Department that enforces import tariffs	the power or right to give orders or make decisions
	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