backyard vs lawn

backyard

noun
  • A yard to the rear of a house or similar residence. 

  • An area nearby to a country or other jurisdiction's legal boundaries, particularly an area in which the country feels it has an interest. 

  • A person's neighborhood, or an area nearby to a person's usual residence or place of work and where the person is likely to go. 

lawn

noun
  • Ground (generally in front of or around a house) covered with grass kept closely mown. 

  • An overgrown agar culture, such that no separation between single colonies exists. 

  • An open space between woods. 

  • A type of thin linen or cotton. 

  • Pieces of this fabric, especially as used for the sleeves of a bishop. 

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