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

下馴し[shitanarashi] training
馴れる[nareru] to grow accustomed (to)
仕馴れる[shinareru] to be used to doing
使い馴れる[tsukainareru] to get accustomed to using
飼い馴らす[kainarasu] to tame (e.g. animal)

住み馴れる[suminareru] to get used to living in
乗り馴らす[norinarasu] to break in (a horse)
人馴れ[hitonare] used to people
馴れ合い[nareai] collusion
馴れ合う[nareau] to collude (with)