Both labels sound like psychiatric diagnoses, but actually they’re not. According to Heinz Kohut and other theorists, narcissism is a quality everyone has to a greater or lesser degree."
"Renowned psychopathy researcher Robert Hare notes that “psychopathy is dimensional (i.e., more or less), not categorical (i.e., either or).” 
"DSM-IV doesn’t include a diagnosis called “psychopathy” or “sociopathy.” Instead, there is antisocial personality disorder, which overlaps with psychopathy but is not the same thing."
"Third, the label adds power to our verbal disapproval. We have a long history of abusing psychiatric labels in the service of putting others down. Consider “idiot,” “moron,” and “imbecile,” all originally coined as official categories describing low IQ. Or “cretin,” 
"Psychology Today" Dr. Steven Reidbord M.D.