doctor

noun:a qualified medical professional licensed to practice medicine
- She visited her doctor for a routine check‑up.
noun:a person who holds a doctoral degree, such as a phd or md
- She became a Doctor of Philosophy after defending her thesis.
verb:to practice medicine; to treat or examine a patient
- The veterinarian will doctor the injured horse this afternoon.
verb:to alter, falsify, or manipulate something, especially documents, data, or evidence
- He tried to doctor the email to make it look like it came from his boss.