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

金利鞘[kinrishou] interest margin
元鞘[motosaya] returning to normal after all is said and done
朱鞘[shuzaya] red-lacquered sword sheath
腱鞘[kenshou] sheath of tendon
腱鞘炎[kenshouen] inflammation of a tendon (sheath)

値鞘[nezaya] margin
鞘当て[sayaate] rivalry (in love, touching of sheaths)
逆鞘[gyakuzaya] (discount rate) negative spread
鞘取り[sayatori] brokerage