What is the highest degree in nursing that you can get?

Nurse practictioner. This position a lot of the duties of a physician, including writing prescriptions. They work along with physicians and maintain some aspects of nursing in their profession.

This is a description by the AMERICAN ACADEMY OF NURSE PRACTITIONERS:

Nurse practitioners are primary care providers who practice in ambulatory, acute and long term care settings. According to their practice specialty these providers provide nursing and medical services to individuals, families and groups. In addition to diagnosing and managing acute episodic and chronic illnesses, nurse practitioners emphasize health promotion and disease prevention. Services include, but are not limited to ordering, conducting, supervising, and interpreting diagnostic and laboratory tests, and prescription of pharmacologic agents and non pharmacologic therapies. Teaching and counseling individuals, families and groups are a major part of nurse practitioner practice. Nurse practitioners practice autonomously and in collaboration with health care professionals and other individuals to diagnose, treat and manage the patient鈥檚 health problems. They serve as health care researchers, interdisciplinary consultants and patient advocates.

Some universities offer masters and doctoral degrees in nursing. However, unless you wanted to teach, why would you acquire a graduate level degree in what is, by definition, an undergraduate profession?

Yes it is Nurse Practitioner. They can also teach Nursing.