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Arzt vs. Doktor

In German, both Arzt and Doktor can mean doctor or physician, but they are used in different contexts. Understanding their distinctions is key to using them correctly in conversation and writing.

Arzt

A1
Arzt refers explicitly to a medical professional who is licensed to diagnose and treat diseases. It is a profession-specific term and directly means physician or doctor in the medical sense. It is used to describe someone who practices medicine.
Ich habe morgen einen Termin beim Arzt.
(I have an appointment with the doctor tomorrow.)
Der Arzt verschrieb mir ein Antibiotikum.
(The doctor prescribed me an antibiotic.)
Nicht jeder Doktor ist ein Arzt.
(Not every doctor is a physician.)

Doktor

A2
Doktor is a title given to someone who has earned a doctorate degree (PhD or equivalent) in any field, not just medicine. However, in informal use, Doktor can also refer to a medical doctor, as it is colloquially used to address medical professionals.
Er hat den Titel Doktor der Biologie.
(He holds the title of Doctor of Biology.)
Die Patienten nennen den Arzt oft einfach Doktor.
(Patients often simply call the physician doctor.)
Frau Doktor Müller hat mir sehr geholfen.
(Dr. Müller was very helpful to me.)

Summary

In German, Arzt specifically refers to a medical doctor or physician, while Doktor is a broader title for anyone with a doctorate, though it can also be informally used to address a physician. Arzt is profession-specific, whereas Doktor denotes an academic achievement or is used colloquially. Knowing the context helps in choosing the correct term.