noun
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.
虐待者はしばしば被害者を孤立させようとする。
Abusers often try to isolate their victims.
動物の虐待者は厳しく罰せられるべきだ。
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).