A nanny is a babysitter for a child up to three years old. A person otherwise known as a nanny, undertakes to raise other people's children, while collecting an appropriate salary. Usually her job is to play with the children, feed them, change diapers, change clothes and so on.
A nurse is a profession whose name begins with the letter N. The job consists in taking care of a usually sick patient. Other tasks of a nurse may include, for example, assisting a doctor in procedures and operations. There are many different specializations in this profession.