Physician A doctor; a person who has been educated, trained, and licensed to practice the art and science of medicine. Health Role The roles of the persons involved in the assistive context. Patient A person who participates in a healthcare act while playing the patient role. Nurse A person trained to care for the sick or infirm, especially in a hospital. has patient The patient who participates to the Action. has health role It relates a person with its role in a health context.