assistant vs nurse practitioner

assistant

noun
  • A person who assists or helps someone else. 

  • A software tool that provides assistance in some task, a wizard program. 

  • Sales assistant. 

adj
  • Helping; lending aid or support; auxiliary. 

  • Having a subordinate or auxiliary position. 

nurse practitioner

noun
  • A professional nursing designation recognized in some jurisdictions, denoting an individual who is fully qualified as a nurse and who has additional qualifications and authorization to provide diagnoses and/or treatments, including writing prescriptions . 

How often have the words assistant and nurse practitioner occurred in a corpus of books? (source: Google Ngram Viewer )