front yard vs play area

front yard

noun
  • A enclosed and often primarily utilitarian area to the front of a house or similar residence, typically having a hard surface or paving. 

  • A yard to the front of a house or similar residence, typically having a lawn and often trees, shrubs, and/or flowers. 

play area

How often have the words front yard and play area occurred in a corpus of books? (source: Google Ngram Viewer )