Word

こう
efficacy; benefit; efficiency; effect; result; success
Word

甲斐

詮、効
かい
effect; result; worth; use; avail
Word

効果

こうか
effect; effectiveness; efficacy; result; effects (e.g. sound effects, visual effects, special effects)
Word

有効

ゆうこう
validity; legality; availability; effectiveness
Word

効率

こうりつ
efficiency; efficacy; performance; utility factor
Word

無効

むこう
invalid; no effect; unavailable; illegal
Word

効力

こうりょく
effect; efficacy; validity; potency
Word

効く

利く
きく
to be effective; to show effect; to do its work; to carry out its function well; to be possible to use
Word

実効

じっこう
practical effect; efficacy; efficiency
Word

発効

はっこう
coming into effect