island vs Lanai Island

island and Lanai Island both are nouns.

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

island (noun)	Lanai Island (noun)
a zone or area resembling an island	an island of central Hawaii; a pineapple-growing area
a land mass (smaller than a continent) that is surrounded by water