血清[kessei] serum
粛清[shukusei] (political) purge
真清水[mashimizu] pure water
清ます[sumasu] to clear
清む[sumu] to clear (e.g. weather)

清い[kiyoi] clear
清まる[kiyomaru] to be purified
清め[kiyome] purification
清める[kiyomeru] to purify
清らか[kiyoraka] clean

偸閑[akarasama] plain
等閑[naozari] neglect
安閑[ankan] easygoingness
一閑張り[ikkanbari] lacquered papier-mache
閑人[kanjin] man of leisure

閑暇[kanka] leisure
閑居[kankyo] quiet and secluded life
閑散[kansan] deserted (esp. store, market, town, streets)
閑寂[kanjaku] quiet
閑職[kanshoku] leisurely post