レン 
ね.る ね.り 
() practice () refine
      
ねり (n,n-suf) kneading, gloss, tempering
ねる (v5r,vt) (1) to knead, to work over, (2) to polish up (e.g. a plan), (3) to drill, to train
れんしゅう (n,vs) practice, practise

Links: KanjiDic: EDict : Wikimedia
Etymologies: 中文字譜 : 説文解字