効こう Noun English jmdict 1 noun (common) (futsuumeishi) efficacy;benefit;efficiency;effect;result;success
甲斐かい Common Noun English jmdict 1 noun (common) (futsuumeishi) result (that makes an act worthwhile);worth (in doing something);value;effect;use;benefit;avail 苦心の甲斐があった。 That was well worth the trouble. Other forms 詮 【かい】 (rarely used kanji form) · 効 【かい】 (rarely used kanji form)
Shirabe
Shirabe