Virginia vs Potomac

Virginia and Potomac both are nouns.

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

Virginia (noun)	Potomac (noun)
a state in the eastern United States; one of the original 13 colonies; one of the Confederate States in the American Civil War	term sometimes used to refer to Washington, D.C.
one of the British colonies that formed the United States, with capital Jamestown or Williamsburg	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 town in northeastern Minnesota in the heart of the Mesabi Range