に就て[nitsuite] concerning
に就き[nitsuki] because of
去就[kyoshuu] committing one's self
就いては[tsuiteha] in line with this
就きましては[tsukimashiteha] in line with this

就く[tsuku] to ascend (the throne)
就ける[tsukeru] to install (a king, emperor, etc.)
就学[shuugaku] entering school
就学義務[shuugakugimu] compulsory school attendance
就学児童[shuugakujidou] school child

祈誓[kisei] vow
偽り誓う[itsuwarichikau] to swear falsely
偽誓[gisei] perjury
修道誓願[shuudouseigan] vows of religious orders
誓い[chikai] oath

誓う[chikau] to swear
誓願[seigan] vow (e.g. religious)
誓言[seigen] attestation
誓文[seimon] written oath
誓約[seiyaku] written vow