U.S. vs North

U.S. and North both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.S.	Yes	No	No	No
North	Yes	No	No	No

U.S. (noun)	North (noun)
the executive and legislative and judicial branches of the federal government of the United States	the United States (especially the northern states during the American Civil War)
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 region of the United States lying to the north of the Mason-Dixon line
	British statesman under George III whose policies led to rebellion in the American colonies (1732-1792)