demonstrator vs lector

demonstrator

noun
  • An assistant to a lecturer. 

  • The forefinger. 

  • One who demonstrates anything, or proves beyond doubt. 

  • An item, particularly a vehicle, used in demonstrations to a customer or user. 

  • One who demonstrates products in a retail environment; a merchandiser. 

  • One who teaches anatomy from the dissected parts. 

  • One who takes part in a demonstration; a protester. 

lector

noun
  • A public lecturer or reader at some universities. 

  • A person doing voice-over translation of foreign films, especially in Eastern European countries. 

  • A lay person who reads aloud certain religious texts in a church service. 

  • A person who reads aloud to workers to entertain them, appointed by a trade union. 

verb
  • To do a voice-over translation of a film. 

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