Abuser n. : One who abuses [in the various senses of the verb].

Example:
What does the term: "possible credit Abuser" mean in the terms of a collection agency?

Taxonomy
abuser, victim, signs of an abuser, weapons, traits, The Victim, drug abuse, excuse, Abusive men, men and women, alcohol, manipulation, harm, drugs and alcohol, alcohol and drugs, symptoms, Preloads, downloads.

Defination from the web:
abuser ... By causing guilt, the victim is more likely to stay and deal with the abuse, rather then feel "responsible" for any harm their abuser might inflict on themselves. ...