USCB vs Customs Bureau

USCB and Customs Bureau both are nouns.

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

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

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

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

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