Washington vs USA

Washington and USA both are nouns.

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

Washington (noun)	USA (noun)
the federal government of the United States	the army of the United States of America; the agency that organizes and trains soldiers for land warfare
a state in northwestern United States on the Pacific with capital Olympia	North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776
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)