Noc vs. Doc — What's the Difference?

An undercover agent who is given no official cover

A person with an advanced degree licensed to practice in a medical field, such as a physician, dentist, or veterinarian.

(informal) A doctor.

A document, especially (in professional jargon) a piece of technical documentation or legal evidence.

(informal) A documentary.

Clipping of doctorate

A licensed medical practitioner;

The United States federal department that promotes and administers domestic and foreign trade (including management of the census and the patent office); created in 1913