guild vs pocket billiards

guild

noun
  • An organized group of players who regularly play together in a multiplayer game. 

  • A group or association mainly of tradespeople made up of merchants, craftspeople, or artisans for mutual aid, particularly in the Middle Ages. 

  • A group of diverse species that share common characteristics or habits. 

  • A corporation. 

pocket billiards

noun
  • Any of a family of billiards games played on a specific class of billiards table, having six receptacles called pockets along the rails, in which balls are deposited as the main goal of play. 

  • Synonym of pocket pool 

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