Occupation of Che Guevara (not Revolutionary!)

Word Meaning:

DOCTOR — A physician; a member of the medical profession; one who is trained and licensed to heal the sick or injured. The final examination and qualification may award a doctor degree in which case the post-nominal letters are DO, DPM, MD, DMD, or DDS in the US, or MBBS or BDS in the UK.

Definitions from Wiktionary.