OAS vs U.S.

OAS and U.S. both are nouns.

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

OAS (noun)	U.S. (noun)
an association including most countries in the western hemisphere; created in 1948 to promote military and economic and social and cultural cooperation	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