12 Old HSK word(s): ☊有效 ** B ☊效果 ** B ☊效率 ** B ☊疗效 ** D ☊成效 ** D ☊生效 ** D ☊失效 ** D ☊无效 ** D ☊见效 ** D ☊效力 ** D ☊效益 ** D ☊功效 ** D
报效* * 初见成效* * 当日有效* * 仿效* * 后效* * 奇效* * 劝之无效* * 时效* * 收效* * 特效* * 效* * 行之有效* * 药效* * 以观后效* * 音效* * 卓有成效* * 奏效* *

Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

奏 memorialize emperor / report
效 result, effect / effectiveness

Hsk Characters: 效 *
HSK -Characters and beyond:
GbBig5EngRadMegaTripleMultilingual
效 6548 + 效 + + result, effect / effectiveness 攴 交 Tap 交 (AUSHÄNDIGEN) xiao4 +

Korean:

效 + 效 본받을효 (本— to follow the exampleof/model oneself after) or 효험 효 (效驗 the quality/virtue of being efficacious)
傚 + 效 본받을 효
6 NHSK word(s): 效果* 4 xiao4 guo3result/ effect/ quality/ CL:個|个[ge4] 效率* 5 xiao4 lv4efficiency 功效* 6 gong1 xiao4efficacy 生效* 6 sheng1 xiao4to take effect/ to go into effect 效益* 6 xiao4 yi4benefit 成效* 6 cheng2 xiao4effect/ result
KOREAN6000 word(s):
2 KOREAN 2500 New HSK words):
效率 + xiàolǜ (작업 등의) 능률. (jag-eob deung-ui) neunglyul.
效果 + xiàoguǒ 효과. hyogwa.
0 KOREAN Sentence(s):