audience vs inner ear

audience

noun
  • A group of people within hearing; specifically, a large gathering of people listening to or watching a performance, speech, etc. 

  • The readership of a book or other written publication. 

  • A following. 

  • An audiencia (judicial court of the Spanish empire), or the territory administered by it. 

  • A widespread or nationwide viewing or listening public, as of a TV or radio network or program. 

  • A formal meeting with a state or religious dignitary. 

inner ear

noun
  • Mind's ear. 

  • The portion of the ear located within the temporal bone which includes the semicircular canals, vestibule, and cochlea and is responsible for hearing and balance. 

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