island vs Norfolk Island

island and Norfolk Island both are nouns.

Word	Noun	Adjective	Verb	Adverb
island	Yes	No	No	No
Norfolk Island	Yes	No	No	No

island (noun)	Norfolk Island (noun)
a zone or area resembling an island	an island territory of Australia in the Pacific Ocean off the eastern coast of Australia; formerly a British penal colony
a land mass (smaller than a continent) that is surrounded by water