legist vs mouthpiece

legist

noun
  • One skilled in the law. 

  • A writer on law, a legislator, a lawmaker 

mouthpiece

noun
  • A lawyer for the defense. 

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

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

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

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