U.S.A. vs North American country

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

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

U.S.A. (noun)	North American country (noun)
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	any country on the North American continent