island vs Saint Kitts

island and Saint Kitts both are nouns.

Word	Noun	Adjective	Verb	Adverb
island	Yes	No	No	No
Saint Kitts	Yes	No	No	No

island (noun)	Saint Kitts (noun)
a zone or area resembling an island	the largest of the islands comprising Saint Christopher-Nevis
a land mass (smaller than a continent) that is surrounded by water