Isle of Skye vs island

Isle of Skye and island both are nouns.

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

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