island vs St. Kitts

island and St. Kitts both are nouns.

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

island (noun)	St. 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