island vs New Siberian Islands

island and New Siberian Islands both are nouns.

Word	Noun	Adjective	Verb	Adverb
island	Yes	No	No	No
New Siberian Islands	Yes	No	No	No

island (noun)	New Siberian Islands (noun)
a zone or area resembling an island	a group of islands in the Arctic Ocean to the north of Siberia and to the east of the Laptev Sea
a land mass (smaller than a continent) that is surrounded by water