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

一所懸命[isshokenmei] very hard
一生懸命[isshoukenmei] very hard
引っ懸ける[hikkakeru] to hang (something) on (something)
懸り[kakari] starting
懸る[kakaru] to take (a resource, e.g. time or money)

懸ける[kakeru] to hang (e.g. picture)
気懸かり[kigakari] anxiety
懸案[kenan] pending question
懸崖[kengai] overhanging cliff