割り楔[warikusabi] split wedge
楔形[kusabigata] wedge-shape
楔形文字[kusabigatamoji] cuneiform (writing)
楔石[kusabiishi] keystone
楔状[ketsujou] wedge-shaped

楔状骨[ketsujoukotsu] cuneiform (bones)
楔子[kesshi] wedge
合いの楔[ainokusabi] wedge (for securing objects together)
氷楔[hyousetsu] ice wedge

管轄[kankatsu] jurisdiction
管轄官庁[kankatsukanchou] controlling office
所轄[shokatsu] jurisdiction
直轄[chokkatsu] direct control
直轄植民地[chokkatsushokuminchi] crown colony

直轄地[chokkatsuchi] area under direct control (of the shogun)
統轄[toukatsu] unification
分轄[bunkatsu] separate jurisdiction
管轄争い[kankatsuarasoi] jurisdictional dispute