St. Vincent vs island

St. Vincent and island both are nouns.

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

St. Vincent (noun)	island (noun)
an island in the center of the Windward Islands; the largest of the islands comprising Saint Vincent and the Grenadines	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water