| 12 Northwest Caucasian | 12.1 Proto-Northwest Caucasian to Proto-Abazgi | χˤʲ ʁˤʲ → ħ ʕ
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| qˤʷ qˤʷː qˤʷʼ χˤʷ ʁˤʷ → ħʷ ʕʷ qʷ(ʼ) ħʷ (ħʷ?)
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| qˤʷʲ qˤʷʲ qˤʷʲʼ ʁˤʷʲ → qʷ ʕʷ ħʷ ʕʷ
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| 12.2 Proto-Northwest Caucasian to Proto-Circassian | {qˤː,qˤʼ} χˤ ʁˤ → qː χ ʁ
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| {qˤʲ,χˤʲ} qˤʲ ʁˤʲ {qˤʲː qˤʲʼ} → ħ ʔ j
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| {qˤʷː,qˤʷʼ} χˤʷ ʁˤʷ → qʷː χʷ ʁʷ
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| qˤʲʷ {qˤʲʷː,qˤʲʷ} ʁˤʲʷ → ħ ʔʷ w~ʁʷ
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| 12.3 Proto-Northwest Caucasian to Ubykh | qˤʲʷ {qˤʲʷː,qˤʲʷ} ʁˤʲʷ → χʷ qʷʼ w
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