Western Islands vs Hebrides

Western Islands and Hebrides both are nouns.

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

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

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

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

Western Islands (noun)	Hebrides (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