Groundhog Day vs U.S.

Groundhog Day and U.S. both are nouns.

Word	Noun	Adjective	Verb	Adverb
Groundhog Day	Yes	No	No	No
U.S.	Yes	No	No	No

Groundhog Day (noun)	U.S. (noun)
if the ground hog emerges and sees his shadow on this day, there will be 6 more weeks of winter	the executive and legislative and judicial branches of the federal government of the United States
	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