Department of the Interior vs DoI

Department of the Interior and DoI both are nouns.

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

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

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

Other synonyms of Department of the Interior include Interior, Interior Department.

Department of the Interior (noun)	DoI (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