NATO vs U.S.

NATO and U.S. both are nouns.

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

NATO (noun)	U.S. (noun)
an international organization created in 1949 by the North Atlantic Treaty for purposes of collective security	the executive and legislative and judicial branches of the federal government of the United States
	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