U.S.A. vs barrio

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

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

U.S.A. (noun)	barrio (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	an urban area in a Spanish-speaking country
	a Spanish-speaking quarter in a town or city (especially in the United States)