lector vs mouthpiece

lector

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

  • 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. 

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

mouthpiece

noun
  • A spokesman; one who speaks on behalf of someone else. 

  • The part of a wind instrument that is held in or against the mouth. 

  • A lawyer for the defense. 

  • The part of a telephone that is held close to the mouth. 

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