To my undertanding of English word as being a "Doctor or Doktor"
1)a person licensed to practice medicine, as a physician, surgeon, dentist, or veterinarian.
2)a person who has been awarded a doctor's degree: He/she, is a Doctor of Philosophy.
3)a MedicalDoctor: to give medical treatment to; to treat (an ailment); apply remedies act as a physician..etc.
4)a person to restore to original or working condition, repair, mend, able to doctor the chipped vase with a little plastic cement.etc.. And Much More.. So Doctor has abroad meaning of the letter!