Comment: Cf. also Lezg. Khl. k:ap:ač 'hand', Rut. Khniukh. kaba-q̇an, Ag. Burk. gap 'palm of hand'. -ač/-aš in Lezg. and Kryz. are expressive suffixes. The word belongs to the 4th class in Rut. and Kryz. Reflexes reveal a variation of laryngeal features, common for roots of this type (with two stops).