My father is a doctor.

He studied medicine and became a doctor.

Doctors perform diagnoses on patients.

He is my favorite teacher.

He is my music teacher.

Mr. Shi is my neighbor.

He is a very excellent surgeon.

She is a witch doctor, playing the role of a doctor while also being a shrine maiden.

My doctor in charge is very excellent.

He is working as a doctor in the Japan Self-Defense Forces.