island vs Admiralty Island

island and Admiralty Island both are nouns.

Word	Noun	Adjective	Verb	Adverb
island	Yes	No	No	No
Admiralty Island	Yes	No	No	No

island (noun)	Admiralty Island (noun)
a zone or area resembling an island	an Alaskan island in the Alexander Archipelago near Juneau
a land mass (smaller than a continent) that is surrounded by water