火山灰[kazanbai] volcanic ash
灰になる[haininaru] to be reduced to ashes
灰の水曜日[hainosuiyoubi] Ash Wednesday
灰押さえ[haiosae] ash leveler (use in a brazier)
灰押し[haioshi] ash leveler (use in a brazier)

灰殻[haigara] ashes
灰均し[hainarashi] ash leveler
灰皿[haizara] ashtray
灰受け[haiuke] ash pan

燐寸[macchi] match (contest)
燐酸[rinsan] phosphoric acid (H3PO4)
黄燐[ourin] yellow (white) phosphorus
燐灰石[rinkaiseki] apatite
燐火[rinka] phosphorous light

燐光[rinkou] phosphorescence
燐鉱[rinkou] phosphoric ore
燐酸肥料[rinsanhiryou] phosphate fertilizer
亜燐酸[arinsan] phosphonic acid (H3PO3)

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