What are the words for "doctor" in English?

doctor English [?d?kt?(r)] American [?dɑ:kt?(r)]

n. doctor; doctor, doctor; theologian; medical equipment

vt. & vi. medical treatment, the practice of medicine

vt. to repair, to assemble; to fake; to adulterate; to modify, to trim

Example sentences:

He is a doctor of philosophy. is a doctor of philosophy.

He is a doctor of philosophy.