ballpark vs bean bag

ballpark

adj
  • Approximate; close; on the right order of magnitude. 

noun
  • The general vicinity; somewhere close; a broad approximation. 

  • A field, stadium or park where ball, especially baseball, is played. 

verb
  • To make a rough estimate of. 

bean bag

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