Samoan Islands vs island

Samoan Islands and island both are nouns.

Word	Noun	Adjective	Verb	Adverb
Samoan Islands	Yes	No	No	No
island	Yes	No	No	No

Samoan Islands (noun)	island (noun)
a group of volcanic islands in the South Pacific midway between Hawaii and Australia; its climate and scenery and Polynesian culture make it a popular tourist stop	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water