island vs Isle of Skye

island and Isle of Skye both are nouns.

Word	Noun	Adjective	Verb	Adverb
island	Yes	No	No	No
Isle of Skye	Yes	No	No	No

island (noun)	Isle of Skye (noun)
a zone or area resembling an island	an island of northwestern Scotland noted for its rugged mountain scenery
a land mass (smaller than a continent) that is surrounded by water