冶具[jigu] jig (tool)
鍛冶[kaji] smithing
刀鍛冶[katanakaji] swordsmith
冶金[yakin] metallurgy
冶金学[yakingaku] metallurgy (the science)

冶金学者[yakingakusha] metallurgist
冶工[yakou] metallurgical worker
陶冶[touya] training
鍛冶屋[kajiya] smith

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