一介[ikkai] mere
荷厄介[niyakkai] encumbrance
介して[kaishite] through the medium of
介意[kaii] worrying about
介殻[kaikaku] sea shell

介護[kaigo] nursing
介甲[kaikou] crust-like shell
介在[kaizai] mediation
介錯[kaishaku] suicide assistant
介添え[kaizoe] helper

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