Bureau of Customs vs USCB

Bureau of Customs and USCB both are nouns.

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

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

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

Other synonyms of Bureau of Customs include Customs Bureau, Customs Service.

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