It has been suggested that psychopathy is associated with instrumental, also known as predatory, proactive, or cold blooded aggression, a form of aggression characterized by reduced emotion and conducted with a goal differing from but facilitated by the commission of harm.
https://en.wikipedia.org/wiki/Psychopathy
Warning: this post contains graphic language and content. The term sociopath has a distinct meaning from psychopath, psychotic and other psych names that get tossed around in the media, by forensic specialists and on TV shows about murderers. But there are differences that distinguish sociopathy from psychopathy.
http://www.huffingtonpost.com/robert-siciliano/what-is-a-sociopath_b_5877160.html
1 Prone to nervousness, distress and temper meltdowns, not easily calm and suave like the psychopath. 2  Usually not well-educated, often non-gainfully employed, the drifter type, the one whom everyone sees as troubled or disturbed..  Their crimes typically are sloppy rather than meticulously premeditated and planned.
http://www.huffingtonpost.com/robert-siciliano/what-is-a-sociopath_b_5877160.html
A key difference between a psychopath and a sociopath is whether he has a conscience, the little voice inside that lets us know when we’re doing something wrong, says L. Michael Tompkins, EdD. He's a psychologist at the Sacramento County Mental Health Treatment Center. A psychopath doesn’t have a conscience. If he lies to you so he can steal your money, he won’t feel any moral qualms, though he may pretend to. He may observe others and then act the way they do so he’s not “found out,” Tompkins says. A sociopath typically has a conscience, but it’s weak.
http://www.webmd.com/mental-health/features/sociopath-psychopath-difference
This pattern has also been referred to as psychopathy, sociopathy, or dissocial personality disorder. A diagnosis of ASPD is based largely on explicit behavioral patterns, whereas measurement tools such as the PCL or PPI also largely, or solely, rely on judgment or self-reports of personality traits.
https://en.wikipedia.org/wiki/Psychopathy
Studies also indicate that different aspects of the definition of psychopathy (e.g. interpersonal, affective (emotion), behavioral and lifestyle components) can show different links to intelligence, and the result can depend on the type of intelligence assessment (e.g. verbal, creative, practical, analytical).
https://en.wikipedia.org/wiki/Psychopathy
The sociopath can be thought of as the rudimentary or undeveloped psychopath. The psychopath simply cannot form emotional bonds with humans. They lack empathy. But they can sure trick people into thinking completely the opposite with their charm and superior intelligence.
http://www.huffingtonpost.com/robert-siciliano/what-is-a-sociopath_b_5877160.html
Psychopathy (/saɪˈkɒpəθi/), sometimes also known as sociopathy (/soʊsiˈɒpəθi/), is traditionally defined as a personality disorder characterized by persistent antisocial behavior, impaired empathy and remorse, and bold, disinhibited, egotistical traits.
https://en.wikipedia.org/wiki/Psychopathy
The DSM and International Classification of Diseases (ICD) subsequently introduced the diagnoses of antisocial personality disorder (ASPD) and dissocial personality disorder respectively, stating that these diagnoses have been referred to (or include what is referred to) as psychopathy or sociopathy.
https://en.wikipedia.org/wiki/Psychopathy
In movies and TV shows, psychopaths and sociopaths are usually the villains who kill or torture innocent people. In real life, some people with antisocial personality disorder can be violent, but most are not. Instead they use manipulation and reckless behavior to get what they want.
http://www.webmd.com/mental-health/features/sociopath-psychopath-difference
define psychopath
Psychopath is defined as a personality disorder characterized by persistent antisocial behavior, impaired empathy and remorse, and bold, disinhibited, egotistical traits. A psychopath is a personality disorder characterized by persistent antisocial behavior, impaired empathy and remorse, and bold, disinhibited, egotistical traits.