Western Islands vs Hebridean Isles

Western Islands and Hebridean Isles both are nouns.

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

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

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

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

Western Islands (noun)	Hebridean Isles (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