What is the difference between antisocial personality disorder and psychopathy?

Empathy: Psychopathy is considered a severe form of antisocial personality (ASP). However, there is a big difference and that is the ability to empathize with others. While a characteristic of ASP is a lack of concern for the rights of others, they do have the ability to empathize, particularly with those close to them. However, it is generally accepted that true psychopaths do not have this ability.

Interchangable: Essentially the terms are interchangeable, with neither really being worse than the other. The full, true clinical term is antisocial personality disorder, the hallmark of which is for the most part, a person who has no conscience.