Saint Lucia vs Caribbean

Saint Lucia and Caribbean both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint Lucia	Yes	No	No	No
Caribbean	Yes	No	No	No

Saint Lucia (noun)	Caribbean (noun)
a country on the island of Saint Lucia; gained independence from Great Britain in 1979	region including the Caribbean Islands
a volcanic island in the Windward Isles to the south of Martinique	an arm of the Atlantic Ocean between North and South America; the origin of the Gulf stream