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

蛍光塗料[keikoutoryou] fluorescent paint
蛍光物質[keikoubusshitsu] fluorescent substance
蛍狩り[hotarugari] firefly catching
蛍雪の功[keisetsunokou] the fruit of diligent study
蛍火[hotarubi] light of a firefly

蛍光[keikou] fluorescence
蛍光燈[keikoutou] fluorescent lamp
蛍烏賊[hotaruika] firefly squid (Watasenia scintillans)
蛍石[hotaruishi] fluorite

螢雪[keisetsu] diligent study
螢火[keika] light of a firefly
螢光[keikou] fluorescence

螢光燈[keikoutou] fluorescent lamp
螢石[keiseki] fluorite
螢光ペン[keikoupen] highlighter