Sandwich Islands vs H.I.

Sandwich Islands and H.I. both are nouns.

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

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

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

Other synonyms of Sandwich Islands include Hawaiian Islands.

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