Organization of American States vs Antigua and Barbuda

Organization of American States and Antigua and Barbuda both are nouns.

Word	Noun	Adjective	Verb	Adverb
Organization of American States	Yes	No	No	No
Antigua and Barbuda	Yes	No	No	No

Organization of American States (noun)	Antigua and Barbuda (noun)
an association including most countries in the western hemisphere; created in 1948 to promote military and economic and social and cultural cooperation	a country in the northern Leeward Islands