island vs Lanai

island and Lanai both are nouns.

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

island (noun)	Lanai (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