The Proto-Kartvelian word txem-
Word txem-
Meaning head, top
Synonyms dud, taw, txam

Comments
Heinz Fähnrich, Surab Sardshweladse: Etymologisches Woerterbuch der Kartwel-Sprachen, 1995 Brill

Other words that might be of interest
berq ‘leg, step’, gul ‘heart, core’, ḳ̣ud ‘tail’, ḳ̣uṭu ‘boy, penis’, ḳwad- ‘tail’, loḳ- ‘to lick’, mḳ̣erd ‘breast, chest’, nena ‘tongue, word, language’, pol- ‘hoof, leg’, prcxa ‘nail, claw’, qe ‘hand, arm’, q̣le ‘penis’, q̇wer ‘testicle’, q̣wiʓ₁ ‘to raise, wake, be awake’, šubl ‘forehead, front part’, twal ‘eye’, zisxl ‘blood’, Ʒ₁u- ‘tail’