Hebrides vs Western Islands

Hebrides and Western Islands both are nouns.

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

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

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

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

Hebrides (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