Hebridean Isles vs Western Islands

Hebridean Isles and Western Islands both are nouns.

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

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

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

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

Hebridean Isles (noun)	Western 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