Organization of American States vs US

Organization of American States and US both are nouns.

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

Organization of American States (noun)	US (noun)
an association including most countries in the western hemisphere; created in 1948 to promote military and economic and social and cultural cooperation	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