Organization of American States vs United Mexican States

Organization of American States and United Mexican States both are nouns.

Word	Noun	Adjective	Verb	Adverb
Organization of American States	Yes	No	No	No
United Mexican States	Yes	No	No	No

Organization of American States (noun)	United Mexican States (noun)
an association including most countries in the western hemisphere; created in 1948 to promote military and economic and social and cultural cooperation	a republic in southern North America; became independent from Spain in 1810