御食い初め[okuizome] weaning ceremony
為初め[shisome] outset
為初める[shisomeru] to begin to do
仮初[karisome] temporary
業界初[gyoukaihatsu] the industry's first ...

月初め[tsukihajime] beginning of month
最初[saisho] beginning
初めに[hajimeni] to begin with (used as an introduction)
初めは[hajimeha] at first
手初めに[tehajimeni] at first

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)