cochlea vs listener

cochlea

noun
  • The complex, spirally coiled, tapered cavity of the inner ear of higher vertebrates, which contains the organ of Corti and in which sound vibrations are converted into nerve impulses. 

  • A spiral-shaped shell, especially that of a snail. 

listener

noun
  • A person's ear. 

  • Someone who listens, especially to a speech or a broadcast. 

  • A musical anthology. 

  • A function that runs in response to an event; an event handler. 

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