Customs Bureau vs USCB

Customs Bureau and USCB both are nouns.

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

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

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

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

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