悪習慣[akushuukan] bad habit
慣らす[narasu] to accustom
慣れ[nare] practice
慣れる[nareru] to grow accustomed (to)
慣行[kankou] customary practice

慣行取引き[kankoutorihiki] usual business practices (practises)
慣習[kanshuu] usual (historical) custom
慣性[kansei] inertia
慣用[kanyou] common
慣用句[kanyouku] idiomatic usage

鵜飼[ugai] cormorant fishing
牛飼い[ushikai] cattleman
子飼い[kogai] protege
飼い馴らす[kainarasu] to tame (e.g. animal)
飼う[kau] to keep (a pet or other animal)

飼育[shiiku] breeding
飼料[shiryou] fodder
羊飼い[hitsujikai] shepherd
飼犬[kaiinu] pet dog
飼主[kainushi] shepherd