A Registered Nurse (RN) is a health-care professional who has graduated from a nursing program and is licensed by a country, state, or other government authorized body. Their role is to provide care to individuals, families, and communities. They can work in various settings and can specialize in a variety of fields of practice. One of these specializations includes Nurse Anesthesist.
An Anesthesiologist is a doctor who specializes in administering anesthesia during surgical procedures. They can also provide a wide variety of services.
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Maybe you are asking about CRNA. Certified registered nurse anesthetist. 4 year nursing degree, 2 years working in ICU or ER and another at least 2 years of school.