District of Columbia vs Washington

District of Columbia and Washington both are nouns.

Word	Noun	Adjective	Verb	Adverb
District of Columbia	Yes	No	No	No
Washington	Yes	No	No	No

District of Columbia (noun)	Washington (noun)
the district occupied entirely by the city of Washington; chosen by George Washington as the site of the capital of the United States and created out of land ceded by Maryland and Virginia	the federal government of the United States
	a state in northwestern United States on the Pacific with capital Olympia
	the capital of the United States in the District of Columbia and a tourist mecca; George Washington commissioned Charles L'Enfant to lay out the city in 1791
	1st President of the United States; commander-in-chief of the Continental Army during the American Revolution (1732-1799)
	United States educator who was born a slave but became educated and founded a college at Tuskegee in Alabama (1856-1915)