Proto-Northwest Caucasian language

Proto-Northwest Caucasian (sometimes abbreviated PNWC), also Proto-Adyghe-Abazgi or Proto-Adyghe-Abkhaz, is the reconstructed common ancestor of the Northwest Caucasian languages.

Consonants

 * 1) In Circassian and Abkhaz, gʷǝ is heart and in Ubykh it's gʲǝ.

The most noticeable changes are:
 * The uvular consonants (/χ/ /ʁ/ /χʷ/ /ʁʷ/) become pharyngeal consonants (/ħ/ /ʕ/ /ħʷ/ /ʕʷ/) in the Proto-Abazgi language.