Western Islands vs Hebridean Islands

Western Islands and Hebridean Islands both are nouns.

Word	Noun	Adjective	Verb	Adverb
Western Islands	Yes	No	No	No
Hebridean Islands	Yes	No	No	No

As nouns, Western Islands and Hebridean Islands are synonyms defined as:

Western Islands and Hebridean Islands: a group of more than 500 islands off the western coast of Scotland

Other synonyms of Western Islands include Hebridean Isles, Hebrides, Western Isles.

Western Islands (noun)	Hebridean Islands (noun)
a group of more than 500 islands off the western coast of Scotland	a group of more than 500 islands off the western coast of Scotland