Western Isles vs Hebridean Isles

Western Isles and Hebridean Isles both are nouns.

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

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

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

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

Western Isles (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