parrock vs schoolyard

parrock

noun
  • An enclosure; a park; a croft, or small field; a paddock. 

verb
  • To enclose or shut in; park. 

schoolyard

noun
  • An open field near a school used for recreation by the students. 

  • The grounds around a school. 

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