island vs Hawaii Island

island and Hawaii Island both are nouns.

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

island (noun)	Hawaii Island (noun)
a zone or area resembling an island	the largest and southernmost of the Hawaii islands; has several volcanic peaks
a land mass (smaller than a continent) that is surrounded by water