Potomac vs Washington

Potomac and Washington both are nouns.

Word	Noun	Adjective	Verb	Adverb
Potomac	Yes	No	No	No
Washington	Yes	No	No	No

Potomac (noun)	Washington (noun)
term sometimes used to refer to Washington, D.C.	the federal government of the United States
a river in the east central United States; rises in West Virginia in the Appalachian Mountains and flows eastward, forming the boundary between Maryland and Virginia, to the Chesapeake Bay	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)