U.S. vs North American nation

U.S. and North American nation both are nouns.

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

U.S. (noun)	North American nation (noun)
the executive and legislative and judicial branches of the federal government of the United States	any country on the North American continent
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