çerx

wheel, period, cycle, circle, cylinder

From Avestan caraiti "applies himself", c'axra "chariot, wagon", skarenayå [skarena] circular, round.

Proto-Indo-European root *kwel- *kwelə- meaning "revolve, move round; sojourn, dwell" or PIE root *kers- "to run".

Sanskrit cakram "circle, wheel", carati "he moves, wanders",
Greek kyklos "circle", -khouros "running",
Persian çarχ چرخ "wheel",
Latin currere "to run, move quickly",
Lithuanian karšiu, karšti "go quickly",
Old Irish and Middle Welsh carr "cart, wagon",
Breton karr "chariot",
Welsh carrog "torrent",
Old Norse horskr "swift".

car, career, cargo, caricature, cark, carpenter, carriage, carrier, carry, cart, charabanc, charette, charge, chariot, concourse, concur, concurrent, corral, corridor, corsair, courant, courier, course, currency, current, curriculum, cursive, cursor, cursory, discharge, discourse, encharge, excursion, hussar, incur, intercourse, kraal, miscarry, occur, precursor, recourse, recur, succor.