OAS vs Colombia

OAS and Colombia both are nouns.

Word	Noun	Adjective	Verb	Adverb
OAS	Yes	No	No	No
Colombia	Yes	No	No	No

OAS (noun)	Colombia (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 northwestern South America with a coastline on the Pacific Ocean and the Caribbean Sea; achieved independence from Spain in 1821 under the leadership of Simon Bolivar; Spanish is the official language