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

鑒みる[kangamiru] to heed
鑒識[kanshiki] judgement

降鑒[koukan] the gods watching over humans from the heavens
清鑒[seikan] excellent judgement