Aleutian Islands vs Aleutians

Aleutian Islands and Aleutians both are nouns.

Word	Noun	Adjective	Verb	Adverb
Aleutian Islands	Yes	No	No	No
Aleutians	Yes	No	No	No

As nouns, Aleutian Islands and Aleutians are synonyms defined as:

Aleutian Islands and Aleutians: an archipelago in the North Pacific extending southwest from Alaska

Aleutian Islands (noun)	Aleutians (noun)
an archipelago in the North Pacific extending southwest from Alaska	an archipelago in the North Pacific extending southwest from Alaska