Proto-Tsezian: *zobo (~ zʷɨ-)
Meaning: ramson
Tsezi: zu
Khvarshi: zu (Radzhibov)
Inkhokvari: zũ
Bezhta: sobo (Tlad.)
Gunzib: so (Gunz.)
Comments: PTsKh *zu (nasalisation in Inkh. is probably secondary); PGB *sobo. The Gunz. form so is a result of reinterpreting -bo as oblique base marker (the paradigm in Gunz. is so, sobo-s). Still earlier the same process (*zubV reinterpreted as zu + -bV) must have happened in PTsKh.
