Maui vs island

Maui and island both are nouns.

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

Maui (noun)	island (noun)
the second largest of the Hawaiian Islands	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water