担任 (たんにん)being in charge of (esp. a class or subject); taking charge of; class teacher

being in charge of (esp. a class or subject); taking charge ofnoun (common) (futsuumeishi), noun or participle which takes the aux. verb suru
class teacher; homeroom teacher; form teachernoun (common) (futsuumeishi)

担任, its kanji, and other words that share them.Open this graph

Kanji in 担任

担当たんとうbeing in charge (of an area of responsibility); being responsible (for a work role, etc.)
負担ふたんburden; load
担当者たんとうしゃperson in charge (of an area of work); person responsible
担保たんぽsecurity; guarantee
分担ぶんたんtaking on one's share (e.g. of work); dividing (work, expenses, etc.) between
担い手にないてbearer; carrier
加担かたんsupport; participation
担ぎかつぎcarrier
責任せきにんduty; responsibility (incl. supervision of staff)
就任しゅうにんassumption (of office); taking up (a post)
辞任じにんresignation (from a position)
任期にんきterm of office
常任じょうにんstanding; regular
後任こうにんsuccessor
責任者せきにんしゃperson in charge (including a supervisory role for other staff); person responsible for ...
不信任ふしんにんnon-confidence; lack of confidence

See how 担任 connects to the rest of Japanese.