Western Asturian, is a linguistic variety in Western Asturian lands between the rivers Navia and Nalón, and western provinces of León, where is called Leonese as endonym, Zamora and Salamanca.
Exonym and endonym, the name used by people to refer to themselves or their language, synonymous with "endonym"
Equivalent terms are exonym ("outside name") and endonym ("inside name"), used especially in toponomastics for place names (toponyms) deriving either from a local language (endonym) or from a distant/foreign language (exonym).
As can be seen from the name Zo ("of the hills") and Mizoram ("people hill country"), Zo among the Northern Kukish languages is closely related to the Central Kukish languages such as the Lushai or Mizo language (endonym in Lushai is Mizo ṭawng), the main language of Mizoram.