abuser; perpetrator of abuse
Refers to a person who mistreats or harms another person or an animal. Often used in contexts of domestic violence, child abuse, or animal cruelty.
Abusers often try to isolate their victims.
Animal abusers should be severely punished.
虐待 is the act of abuse itself, while 虐待者 is the person who commits it.
Compound of 虐待 (abuse) + 者 (person).