U.S. vs Washington's Birthday

U.S. and Washington's Birthday both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.S.	Yes	No	No	No
Washington's Birthday	Yes	No	No	No

U.S. (noun)	Washington's Birthday (noun)
the executive and legislative and judicial branches of the federal government of the United States	the day on which George Washington is remembered
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