H.I. vs Sandwich Islands

H.I. and Sandwich Islands both are nouns.

Word	Noun	Adjective	Verb	Adverb
H.I.	Yes	No	No	No
Sandwich Islands	Yes	No	No	No

As nouns, H.I. and Sandwich Islands are synonyms defined as:

H.I. and Sandwich Islands: a group of volcanic and coral islands in the central Pacific

Other synonyms of H.I. include Hawaiian Islands.

H.I. (noun)	Sandwich Islands (noun)
a group of volcanic and coral islands in the central Pacific	a group of volcanic and coral islands in the central Pacific