Customs Service vs USCB

Customs Service and USCB both are nouns.

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

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

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

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

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