physician,
doc,
dr.,
medico,
doctor,
md 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"
intern -
To work as an intern. Usually with little or no pay or other legal prerogatives of employment, for the purpose of furthering a program of education.
An intern is someone who works in a temporary position with an emphasis on on-the-job training rather than merely employment (SIH-199), making it similar to an apprenticeship. Interns are usually college or university students, but they can also be high school students or post graduate adults seeking skills for a new career. Student internships provide opportunities for students to gain experience in their field, determine if they have an interest in a particular career, create a network of contacts, or gain school credit.