doctor has 15 distinct synonyms spread across 5 of its 7 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a licensed medical practitioner
“I felt so bad I went to see my doctor”
(Roman Catholic Church) a title conferred on 33 saints who distinguished themselves through the orthodoxy of their theological teaching
“the Doctors of the Church greatly influenced Christian thought down to the late Middle Ages”
children take the roles of physician or patient or nurse and pretend they are at the physician's office
“the children explored each other's bodies by playing the game of doctor”
alter and make impure, as with the intention to deceive
“Sophisticate rose water with geraniol”
Synonyms, antonyms and the broader and narrower relations for doctor come from Princeton University’s WordNet. Full sources and licences.