island vs Samoan Islands

island and Samoan Islands both are nouns.

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

island (noun)	Samoan Islands (noun)
a zone or area resembling an island	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 land mass (smaller than a continent) that is surrounded by water