balcony vs balustrade

balcony

noun
  • An accessible structure extending from a building, especially outside a window. 

  • An accessible structure overlooking a stage or the like. 

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. 

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