四面楚歌[shimensoka] being surrounded by enemies on all sides
楚楚[soso] graceful

清楚[seiso] neat and clean
楚蟹[zuwaigani] snow crab (Chionoecetes opilio)

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