Hawaii Island vs H.I.

Hawaii Island and H.I. both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hawaii Island	Yes	No	No	No
H.I.	Yes	No	No	No

Hawaii Island (noun)	H.I. (noun)
the largest and southernmost of the Hawaii islands; has several volcanic peaks	a group of volcanic and coral islands in the central Pacific