Newfoundland vs island

Newfoundland and island both are nouns.

Word	Noun	Adjective	Verb	Adverb
Newfoundland	Yes	No	No	No
island	Yes	No	No	No

Newfoundland (noun)	island (noun)
a breed of very large heavy dogs with a thick coarse usually black coat; highly intelligent dogs and vigorous swimmers; developed in Newfoundland	a zone or area resembling an island
an island in the north Atlantic	a land mass (smaller than a continent) that is surrounded by water