auditorium vs bleacher

auditorium

noun
  • the space where the audience is located 

  • a large room for public meetings or performances 

bleacher

noun
  • The tiered seating provided for the audience at a television filming. 

  • One who, or that which, bleaches. 

  • A stand of tiered planks used as seating for spectators, often outdoors. 

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