Interior Department vs DoI

Interior Department and DoI both are nouns.

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

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

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

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

Interior Department (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