island vs New Zealand Islands

island and New Zealand Islands both are nouns.

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

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