Denshi Jisho — Online Japanese dictionary

こせん 1: (in China) 5th note of the ancient chromatic scale (approx. F sharp);
2: third lunar month
Noun 
すいせん rinsing with water; flushing
Common word, Noun, Suru verb 
いっせん thoroughly wash away
Noun, Suru verb 
じゅせん being baptized; undergoing baptism
Noun, Suru verb 
てあらい 1: washing one's hands; water (or basin, etc.) for washing one's hands;
2: restroom; lavatory; toilet;
3: hand-washing (laundry, etc.)
Noun 
はいせん small vessel or bowl in which sake cups are rinsed
Noun 
ひっせん brush cleaner; brush cleaning; brush washing; writing brush washer
Noun 
御手 みたらし font of purifying water placed at the entrance of a shrine
Noun 
ふであらい brush cleaner; brush cleaning; brush washing; writing brush washer
Noun 

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