abuser
/əˈbjuːzə(r)/noun
usu. with modifier
1- someone who regularly or habitually abuses someone or something, in particular（经常或习惯性的）虐待者; 滥用者, 尤指：
1.1
- someone who makes excessive use of alcohol or illegal drugs酗酒者; 嗜毒者：
intravenous drug abusers.
进行静脉注射的瘾君子。
1.2
- someone who sexually assaults another person, especially a woman or child（尤指对妇女或儿童的）性侵犯者：
an alleged child abuser.
涉嫌猥亵儿童者。