Mustagh mus·tagh uncommon noun 1. a mountain range in northern Kashmir; an extension of the Hindu Kush; contains the 2nd highest peak SynonymsKarakoramKarakoram RangeKarakorum RangeMustagh Range Related words Word family Mustagh Range Broader terms range Parts Kashmir Part of GasherbrumK2Rakaposhi WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.