A psycho-pathologist is a person who studies and diagnoses mental illnesses. There are several synonyms for the term, including psychiatrist, psychologist, therapist, mental health professional, and clinical researcher. A psychiatrist is a medical doctor who specializes in the treatment of mental illnesses. A psychologist is a professional who studies the behavior and mental processes of individuals. A therapist is someone who helps people cope with their emotional or mental problems. A mental health professional is a trained expert who works with individuals to overcome their mental health issues. A clinical researcher is someone who conducts research and studies the clinical effects of mental illnesses.