Arctic Archipelago vs archipelago

Arctic Archipelago and archipelago both are nouns.

Word	Noun	Adjective	Verb	Adverb
Arctic Archipelago	Yes	No	No	No
archipelago	Yes	No	No	No

Arctic Archipelago (noun)	archipelago (noun)
all the islands that lie to the north of mainland Canada and the Arctic Circle	a group of many islands in a large body of water