regicide

n 1 [U] crime of killing a king 弑君罪. 2 [C] person who commits or helps to commit this crime 弑君者; 弑君罪犯或从犯.

refute, regain, regal, regale, regalia, regally, regard, regard...as, regarding, regardless, regardless of, regatta, regd, regency, regenerate, regeneration, regenerative, regent, regent (often 常作 Regent), reggae, regime, regimen, regiment, regimental, regimentals, regimentation, Regina, region, regional, regionalization, regionalize, regionally, register, register office, registered, registered nurse, registered post, registered trade mark, registrar, registration,