mouthpiece vs obtainer

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. 

obtainer

noun
  • One who obtains. 

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