U.S.A. vs AR

U.S.A. and AR both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.S.A.	Yes	No	No	No
AR	Yes	No	No	No

U.S.A. (noun)	AR (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	a state in south central United States; one of the Confederate states during the American Civil War