USCB vs Customs Service

USCB and Customs Service both are nouns.

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

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

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

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

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