castling vs hall

castling

noun
  • A move in which the king moves two squares towards a rook, and the rook moves to the other side of the king; the action of the verb to castle. 

  • One that is cast. 

  • A miniature cast or mould. 

  • The act of constructing a defense structure in Japanese chess in which the king (玉) is positioned in a certain way so that it is protected by pawns (歩) and silver general(s) (銀) and/or gold general(s) (金) often with an additional knight (桂) and lance (香車). 

hall

noun
  • The principal room of a secular medieval building. 

  • A corridor; a hallway. 

  • A meal served and eaten at a college's hall. 

  • A college's canteen, which is often but not always coterminous with a traditional hall. 

  • A meeting room. 

  • A building providing student accommodation at a university. 

  • A living room. 

  • A place for special professional education, or for conferring professional degrees or licences. 

  • A manor house (originally because a magistrate's court was held in the hall of his mansion). 

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