پزشک

پزشک appears on prescriptions, hospital signage, and official documents, while doktor is what you actually say at the clinic. The distinction matters: a دانشجوی پزشکی is a medical student, but the friendly "doctor!" you call out in the waiting room is آقای دکتر (âghâ-ye doktor) or خانم دکتر (khânom-e doktor).