New Zealand Islands vs island

New Zealand Islands and island both are nouns.

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

New Zealand Islands (noun)	island (noun)
North Island and South Island and adjacent small islands in the South Pacific	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water