outdoors vs terracing

outdoors

noun
  • The environment outside of enclosed structures. 

  • The natural environment in the open air, countryside away from cities and buildings. 

adv
  • Not inside a house or under covered structure; unprotected; in the open air. 

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 outdoors and terracing occurred in a corpus of books? (source: Google Ngram Viewer )