Registered nurses (RNs) share one license path but practice in many specialty areas. Common RN specialties include labor and delivery, oncology, pain management, case management, and nurse executive roles. Some specialties are learned mainly on the job; others use formal certifications such as Nursing Case Management (CMGT-BC) or Nurse Executive (NE-BC).
RNs who complete graduate education can become Advanced Practice Registered Nurses (APRNs) in one of four recognized roles: nurse practitioner (NP), clinical nurse specialist (CNS), certified registered nurse anesthetist (CRNA), or certified nurse-midwife (CNM). NP focus areas include family, psychiatric-mental health, women’s health, and acute care.
Source: Three Types of Nurses and What They Do — American Nurses Association