一元[ichigen] unitary
一元化[ichigenka] unification
一元的[ichigenteki] monistic
一元論[ichigenron] monism
一次元[ichijigen] one dimensional

一新紀元[isshinkigen] new era
隠元[ingen] beans
隠元豆[ingenmame] common bean (Phaseolus vulgaris)
家元[iemoto] head of a school (of music, dance)
火の元[hinomoto] origin of fire

バイオ素子[baiososhi] bio-device
弗素[fusso] fluorine (F)
一酸化炭素[issankatanso] carbon monoxide
栄養素[eiyouso] nutrient
塩化水素[enkasuiso] hydrogen chloride

塩素[enso] chlorine (Cl)
塩素酸[ensosan] chloric acid
塩素酸塩[ensosanen] chlorate
音楽の素質[ongakunososhitsu] aptitude for music
音素[onso] phoneme

往還[oukan] traffic
還元[kangen] resolution
還俗[genzoku] return to secular life
還流[kanryuu] return current
還暦[kanreki] 60th birthday

還す[kaesu] to send (someone) back
還り[kaeri] return
還る[kaeru] to return
饋還[kikan] repatriation
強制送還[kyouseisoukan] forced repatriation

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