Aleutians vs archipelago

Aleutians and archipelago both are nouns.

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

Aleutians (noun)	archipelago (noun)
an archipelago in the North Pacific extending southwest from Alaska	a group of many islands in a large body of water