#   Kanji   Kanji Level 3  
375       899
    研ぐ togu to grind, to polish  
           
  けんま 研摩 kenma grinding; polishing; studying  
  けんさん 研鑽 kensan diligent, keen, profound study; pursuit of one's studies 899
           
  けんきゅう 研究 kenkyuu study; research; investigation