Customs Bureau vs Bureau of Customs

Customs Bureau and Bureau of Customs both are nouns.

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

As nouns, Customs Bureau and Bureau of Customs are synonyms defined as:

Customs Bureau and Bureau of Customs: the agency of the Treasury Department that enforces import tariffs

Other synonyms of Customs Bureau include Customs Service, USCB.

Customs Bureau (noun)	Bureau of Customs (noun)
the agency of the Treasury Department that enforces import tariffs	the agency of the Treasury Department that enforces import tariffs