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

葦笛[ashibue] reed pipe
横笛[yokobue] transverse flute (e.g. a fife)
角笛[tsunobue] horn
汽笛[kiteki] steam whistle
響笛[kyouteki] vibrating pipe

警笛[keiteki] horn
鼓笛[koteki] drum and fife
鼓笛隊[kotekitai] drum and fife band
口笛[kuchibue] whistle
喉笛[nodobue] windpipe