There are several synonyms for the term "health care provider," including healthcare professional, medical practitioner, physician, nurse practitioner, physician assistant, and healthcare worker. A healthcare professional is any individual who is trained and licensed to provide medical services, while a medical practitioner is a doctor who provides medical care. A physician is a licensed medical doctor who diagnoses and treats illnesses. A nurse practitioner is an advanced practice registered nurse who can diagnose and treat health problems. A physician assistant is a licensed healthcare worker who provides medical care under the supervision of a physician. Healthcare workers are individuals who provide health care services, such as nurses, medical assistants, and medical technologists.