We all heard the terms "psychopath" o "sociopath". These are the old names for a patient with the Antisocial Personality Disorder (AsPD). It is hard to distinguish narcissists from psychopaths. The latter may simply be a less inhibited and less grandiose form of the former. Indeed, the DSM V Committee is considering to abolish this distinction altogether.
Still, there are some important nuances setting the two disorders apart:

As opposed to most narcissists, psychopaths are either unable o unwilling to control their impulses o to delay gratification. They use their rage to control people...