御祖母さん[obaasan] grandmother
お母[ofukuro] one's mother
御母さん[okaasan] mother
お母さま[okaasama] mother
異母[ibo] different mother

雲母[unmo] mica
義母[gibo] mother-in-law
空母[kuubo] aircraft carrier
継母[keibo] stepmother
賢母[kenbo] wise mother

酵素[kouso] enzyme
酵素学[kousogaku] enzymology
酵母[koubo] yeast
酵母菌[koubokin] yeast fungus
醗酵[hakkou] fermentation

発酵乳[hakkounyuu] yoghurt
発酵素[hakkouso] a ferment
アセトンブタノール発酵[asetonbutanooruhakkou] acetone-butanol fermentation
アポ酵素[apokouso] apoenzyme
アミノ酸発酵[aminosanhakkou] amino-acid fermentation

黄鉄鉱[outekkou] iron pyrites
可鍛鉄[katantetsu] malleable iron
狭軌鉄道[kyoukitetsudou] narrow-gauge railway
近鉄[kintetsu] Kinki Nippon Tetsudou (railway co.)
剣付き鉄砲[kentsukideppou] fixed bayonet

甲鉄[koutetsu] armor
甲鉄艦[koutetsukan] armored ship
甲鉄板[koutetsuban] armor plate
鋼鉄[koutetsu] steel
国鉄[kokutetsu] national railway (esp. Japan National Railways)