Zetland vs archipelago

Zetland and archipelago both are nouns.

Word	Noun	Adjective	Verb	Adverb
Zetland	Yes	No	No	No
archipelago	Yes	No	No	No

Zetland (noun)	archipelago (noun)
an archipelago of about 100 islands in the North Atlantic off the north coast of Scotland	a group of many islands in a large body of water