caretaker vs nurse practitioner

caretaker

noun
  • Someone who takes care of a person; a parent, carer or other guardian. 

  • Someone who takes care of a place or thing; someone looking after a place, or responsible for keeping it in good repair. 

adj
  • Temporary, on a short term basis. 

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 caretaker and nurse practitioner occurred in a corpus of books? (source: Google Ngram Viewer )