WordNet sense 1 ((Roman Catholic Church) a title conferred on 33 saints who distinguished themselves through the orthodoxy of their theological teaching):

Doctor of the Church

WordNet sense 2 (a person who holds Ph.D. degree (or the equivalent) from an academic institution):

Dr.

WordNet sense 3 (a licensed medical practitioner):

doc, physician, Md, medico

WordNet sense 4 (alter and make impure, as with the intention to deceive):

sophisticate, doctor up

WordNet sense 5 (restore by replacing a part or putting together what is torn or broken):

bushel, fix, mend, repair, restore, repair, restore, touch on, furbish up