We don't have synonyms for western isles yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are westernises.
(n) :
The Outer Hebrides, an archipelago of the Hebrides in Scotland.
(n) :
A council area of Scotland, one of 32 created in 1996, the Western Isles Council (officially Scottish Gaelic Comhairle nan Eilean Siar since 1997).
(n) :
The Outer Hebrides, an archipelago of the Hebrides in Scotland.
(n) :
A council area of Scotland, one of 32 created in 1996, the Western Isles Council (officially Scottish Gaelic Comhairle nan Eilean Siar since 1997).