Potomac River vs Virginia

Potomac River and Virginia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Potomac River	Yes	No	No	No
Virginia	Yes	No	No	No

Potomac River (noun)	Virginia (noun)
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 the eastern United States; one of the original 13 colonies; one of the Confederate States in the American Civil War
	one of the British colonies that formed the United States, with capital Jamestown or Williamsburg
	a town in northeastern Minnesota in the heart of the Mesabi Range