balustrade vs bleacher

balustrade

noun
  • A row of balusters topped by a rail, serving as an open parapet, as along the edge of a balcony, terrace, bridge, staircase, or the eaves of a building. 

bleacher

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

  • One who, or that which, bleaches. 

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

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