North American nation vs U.S.A.

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

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

North American nation (noun)	U.S.A. (noun)
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