Nova Zembla vs island

Nova Zembla and island both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nova Zembla	Yes	No	No	No
island	Yes	No	No	No

Nova Zembla (noun)	island (noun)
two islands in the Arctic Ocean belonging to Russia; site of a test center for nuclear warheads	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water