Comments: PAT *cǝxǝ / *c̣ǝxǝ (cf. also Bz. á-cx, Abaz. (Гонов 1956) cǝχǝ); origin of the glottalised variant is not quite clear (all the related languages show no trace of glottalisation in this root). PAK *č:́aš:́ǝ́ (cf. Bzhed. č́aš:́ǝ). Ub. def. á-śǝś.
In Ub. an assimilation has occurred: śǝśǝ < *ćǝśǝ. Otherwise the correspondences are quite regular and point to PWC laterals in both syllables.