This is a very common concept. Let me explain it to you in detail. A psychiatrist is a doctor who studies psychiatry in a hospital and has the qualification of a doctor. If he still has the qualification certificate of psychological counselor, he is a psychological counselor.
Psychologists include psychiatrists. Psychiatry is a branch of medicine. However, psychiatry and psychology are closely related. Psychological problems seriously lead to mental problems. The reason why psychiatry belongs to medical classification rather than psychological classification is mainly because serious mental problems lead to mental abnormalities, which cannot be solved by psychological methods. So it belongs to the medical category.
In other words, a psychologist is a doctor who has a doctor's qualification certificate and is good at mental illness. A psychologist is a psychologist, and a person with a psychological consultant qualification certificate is a psychologist.