island vs St. Lucia

island and St. Lucia both are nouns.

Word	Noun	Adjective	Verb	Adverb
island	Yes	No	No	No
St. Lucia	Yes	No	No	No

island (noun)	St. Lucia (noun)
a zone or area resembling an island	a country on the island of Saint Lucia; gained independence from Great Britain in 1979
a land mass (smaller than a continent) that is surrounded by water	a volcanic island in the Windward Isles to the south of Martinique