nurse practitioner vs sitter

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 . 

sitter

noun
  • A very easy scoring chance. 

  • One employed to watch or tend something; a babysitter, housesitter, petsitter, etc. 

  • A broody hen. 

  • A participant in a séance. 

  • Someone who sits, e.g. for a portrait. 

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