Final answer:
A nurse with an advanced degree who specializes and provides direct patient care, consultation, teaching, and research is known as a Clinical Nurse Specialist (CNS).
Step-by-step explanation:
A nurse with an advanced degree, education, or experience who is considered an expert in a specialized area of nursing and carries out direct patient care, consultation, teaching of patients, families, and staff, and research is known as a Clinical Nurse Specialist (CNS). These healthcare professionals have a significant impact on the education of staff and the improvement of patient care outcomes. Their role often encompasses the management of complex patient care situations, leading initiatives for healthcare improvement, and contributing to medical research. Similar to CNS, a Certified Diabetes Educator is a professional who specializes in educating and treating patients with diabetes and is an example of a nurse taking on a specialized educational role within the nursing profession.