Department of Transportation vs DoT

Department of Transportation and DoT both are nouns.

Word	Noun	Adjective	Verb	Adverb
Department of Transportation	Yes	No	No	No
DoT	Yes	No	No	No

As nouns, Department of Transportation and DoT are synonyms defined as:

Department of Transportation and DoT: the United States federal department that institutes and coordinates national transportation programs; created in 1966

Other synonyms of Department of Transportation include Transportation.

Department of Transportation (noun)	DoT (noun)
the United States federal department that institutes and coordinates national transportation programs; created in 1966	the United States federal department that institutes and coordinates national transportation programs; created in 1966