コスト効率[kosutokouritsu] cost effectiveness
圧電効果[atsudenkouka] piezoelectric effect
偉効[ikou] great effect
逆効果[gyakukouka] backfire
経済効果[keizaikouka] (positive) economic effect

効果[kouka] effect
効果音[koukaon] sound effect
効果的[koukateki] effective
効果覿面[koukatekimen] bring an immediate result on

弄り回す[ijirimawasu] to tinker with
どさ回りをやる[dosamawariwoyaru] to go on tour
螺子回し[nejimawashi] screwdriver
ウイック回転[uikkukaiten] Wick rotation
挨拶回り[aisatsumawari] courtesy call

一回[ikkai] once
ひと回り[hitomawari] one turn
一回忌[ikkaiki] first death anniversary
一回戦[ikkaisen] first game
一回分[ikkaibun] dose

烏有に帰する[uyuunikisuru] to be reduced to ashes
烏有先生[uyuusensei] fictitious person
恩が有る[ongaaru] to be in one's debt
価値有る[kachiaru] valuable
含有[ganyuu] contain

含有量[ganyuuryou] content (of a mineral, etc.)
享有[kyouyuu] possession
共有[kyouyuu] share
共有財産[kyouyuuzaisan] community property
共有者[kyouyuusha] joint owners

加答児[kataru] catarrh
ステップ応答[suteppuoutou] step response
一問一答[ichimonittou] answering question by question
応答[outou] reply
応答能[outounou] competence

押し問答[oshimondou] dispute
解答[kaitou] answer
回答[kaitou] reply
回答者[kaitousha] respondent
確答[kakutou] definite answer