U.S. vs February 12

U.S. and February 12 both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.S.	Yes	No	No	No
February 12	Yes	No	No	No

U.S. (noun)	February 12 (noun)
the executive and legislative and judicial branches of the federal government of the United States	the day on which President Abraham Lincoln 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