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

吉祥[kisshou] lucky omen
休祥[kyuushou] good omen
健祥[kenshou] spirit
清祥[seishou] spirit
多祥[tashou] much happiness

発祥[hasshou] origin
発祥地[hasshouchi] cradle (of civilisation, civilization, etc.)
不祥不祥[fushoubushou] reluctantly
不祥[fushou] disgraceful
不祥事[fushouji] scandal