Maniac vs. Psychopath

Maniacnoun

An insane person, especially one who suffers from a mania.

Maniacnoun

A fanatic, a person with an obsession.

Maniacadjective

Raving with madness; raging with disordered intellect; affected with mania; mad.

Maniacnoun

A raving lunatic; a madman.

Maniacnoun

an insane person

Maniacadjective

wildly disordered;

Psychopathnoun

A person with a personality disorder indicated by a pattern of lying, cunning, manipulating, glibness, exploiting, heedlessness, arrogance, delusions of grandeur, sexual promiscuity, low self-control, disregard for morality, lack of acceptance of responsibility, callousness, and lack of empathy and remorse. Such an individual may be especially prone to violent and criminal offenses.

Psychopathnoun

(figurative) A person with no moral conscience who perpetrates especially gruesome or bizarre violent acts.

Psychopathnoun

A person diagnosed with antisocial or dissocial personality disorder.

Psychopathnoun

(obsolete) A person diagnosed with any mental disorder.

Psychopathnoun

someone with a sociopathic personality; a person with an antisocial personality disorder (`psychopath' was once widely used but has now been superseded by `sociopath')