慣習 （カンシュウ） custom, convention, common practice, becoming accustomed (to)

慣行 （カンコウ） customary practice, habit, traditional event

旧慣 （キュウカン） old customs

購買習慣 （コウバイシュウカン） buying habit

慣れる （なれる） to get used to, to grow accustomed to, to become familiar with, to become skilled in, to become experienced at, to become tame, to become domesticated, to get used to doing

慣らす （ならす） to accustom, to train (e.g. one's ear), to tame, to domesticate, to train (an animal)