U.S.A. vs Groundhog Day

U.S.A. and Groundhog Day both are nouns.

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

U.S.A. (noun)	Groundhog Day (noun)
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	if the ground hog emerges and sees his shadow on this day, there will be 6 more weeks of winter