invigilator vs superintendent

invigilator

noun
  • A person who supervises students during an examination; a proctor 

superintendent

noun
  • A person who is authorized to supervise, direct or administer something. 

  • A police rank used in Commonwealth countries, ranking above chief inspector, and below chief superintendent. 

  • A janitor. 

  • The head of a Sunday school. 

  • The manager of a building, usually a communal residence, who is responsible for keeping the facilities functional and often collecting rent or similar payments, either as also the building's landlord or on behalf of same. Often abbreviated "super". 

  • In some Protestant churches, a clergyman having the oversight of the clergy of a district. 

adj
  • Overseeing; superintending. 

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