Customs Service vs Customs Bureau

Customs Service and Customs Bureau both are nouns.

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

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

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

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

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