U.S. vs North America

U.S. and North America both are nouns.

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

U.S. (noun)	North America (noun)
the executive and legislative and judicial branches of the federal government of the United States	the nations of the North American continent collectively
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	a continent (the third largest) in the western hemisphere connected to South America by the Isthmus of Panama