negative potential form of 欠かす (kakasu) [godan]: indispensable, critical, essential

a floor or storey in a building

Extended shinjitai form of 攪: to disturb

lay down / put down

Kyūjitai form of 撹 (“to disturb”)

generally / approximately

status, rank / (grammar) case (of a word) / capacity / character / case (law)

Kyūjitai form of 改変: alteration, a change

Kyūjitai form of 改変: to alter, to change

dative case