Organization of American States vs USA

Organization of American States and USA both are nouns.

Word	Noun	Adjective	Verb	Adverb
Organization of American States	Yes	No	No	No
USA	Yes	No	No	No

Organization of American States (noun)	USA (noun)
an association including most countries in the western hemisphere; created in 1948 to promote military and economic and social and cultural cooperation	the army of the United States of America; the agency that organizes and trains soldiers for land warfare
	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