belvedere vs terracing

belvedere

noun
  • A turret or other raised structure offering a pleasant view of the surrounding area. 

  • Bassia scoparia (summer cypress) 

terracing

noun
  • A terraced structure. 

  • A series of terraces. 

  • A stand with a series of tiers. 

  • The formation of terraces. 

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