Interior Department vs Department of the Interior

Interior Department and Department of the Interior both are nouns.

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

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

Interior Department and Department of the Interior: the United States federal department charged with conservation and the development of natural resources; created in 1849

Other synonyms of Interior Department include DoI, Interior.

Interior Department (noun)	Department of the Interior (noun)
the United States federal department charged with conservation and the development of natural resources; created in 1849	the United States federal department charged with conservation and the development of natural resources; created in 1849