nouns
a licensed medical practitioner
"I felt so bad I went to see my doctor"
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"
is a type of (narrower)
activity by children that is guided more by imagination than by fixed rules
"Freud believed in the utility of play to a small child"
a person who holds Ph.D. degree (or the equivalent) from an academic institution
"she is a doctor of philosophy in physics"