island vs St. Eustatius

island and St. Eustatius both are nouns.

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

island (noun)	St. Eustatius (noun)
a zone or area resembling an island	an island in the Netherlands Antilles
a land mass (smaller than a continent) that is surrounded by water