That's because the terms "Psychopathy" and "Sociopathy" are criminal legal terms or shorthand and not clinical terms.
The clinical terms [1] are Dissocial Personality Disorder, Narcissistic Personality Disorder and Anti-Social Personality Disorder are most related, though many aspects of "psychopaths" can't be measured - for example how do accurately and repeatably measure "lack of empathy?"
The clinical terms [1] are Dissocial Personality Disorder, Narcissistic Personality Disorder and Anti-Social Personality Disorder are most related, though many aspects of "psychopaths" can't be measured - for example how do accurately and repeatably measure "lack of empathy?"
[1] https://en.wikipedia.org/wiki/Cluster_B_personality_disorder...