圧し石[oshiishi] stone weight
一石[isseki] one game (of go)
一石二鳥[issekinichou] killing two birds with one stone
英国石油[eikokusekiyu] British Petroleum
下石[shitaishi] nether millstone

化粧石鹸[keshousekken] toilet soap
化石[kaseki] fossil
化石学[kasekigaku] paleontology
化石層[kasekisou] fossil bed
化石燃料[kasekinenryou] fossil fuel

草臥れる[kutabireru] to get tired
遺草[isou] posthumous works
一年草[ichinensou] annual (plant)
詠草[eisou] draft poem
下草[shitakusa] undergrowth

仮名草紙[kanazoushi] story in the kana
伽草子[togizoushi] fairy-tale book
海草[kaisou] marine plant
乾草[kansou] hay
甘草[kanzou] liquorice

夏蚕[natsugo] summer silkworms
蚕業[sangyou] sericulture
蚕具[sangu] sericultural equipment
蚕座[sanza] silkworm basket
蚕糸[sanshi] silk thread

蚕糸業[sanshigyou] sericulture industry
蚕糸試験所[sanshishikenjo] silk experiment station
蚕紙[sanshi] silkworm-egg paper
蚕児[sanji] silkworm