What are the differences in education job areas and practices and priviliges of a psychiatrist and psychologist?

A psychiatrist is a medical physician who has specialized in MEDICAL treatment of mental disorders. It requires medical school and specialization in psychiatry.

A psychologist is a clinical worker who is qualified to treat mental issues through psychotherapy/counseling. A psychotherapist must receive, at a minimum, a masters degree in the subject, pass tests and be licensed in most states.