Sandwich Islands vs Hawaiian Islands

Sandwich Islands and Hawaiian Islands both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sandwich Islands	Yes	No	No	No
Hawaiian Islands	Yes	No	No	No

As nouns, Sandwich Islands and Hawaiian Islands are synonyms defined as:

Sandwich Islands and Hawaiian Islands: a group of volcanic and coral islands in the central Pacific

Other synonyms of Sandwich Islands include H.I..

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