Antigua and Barbuda vs Organization of American States

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

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

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