Department of the Treasury vs Treasury Department

Department of the Treasury and Treasury Department both are nouns.

Word	Noun	Adjective	Verb	Adverb
Department of the Treasury	Yes	No	No	No
Treasury Department	Yes	No	No	No

As nouns, Department of the Treasury and Treasury Department are synonyms defined as:

Department of the Treasury and Treasury Department: the federal department that collects revenue and administers federal finances; the Treasury Department was created in 1789

Other synonyms of Department of the Treasury include Treasury, United States Treasury.

Department of the Treasury (noun)	Treasury Department (noun)
the federal department that collects revenue and administers federal finances; the Treasury Department was created in 1789	the federal department that collects revenue and administers federal finances; the Treasury Department was created in 1789