castling vs rook

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). 

rook

noun
  • A piece shaped like a castle tower, that can be moved only up, down, left or right (but not diagonally) or in castling. 

  • A cheat or swindler; someone who betrays. 

  • mist; fog; roke 

  • A castle or other fortification. 

  • A European bird, Corvus frugilegus, of the crow family. 

  • A rookie. 

  • A type of firecracker used by farmers to scare birds of the same name. 

  • A trick-taking game, usually played with a specialized deck of cards. 

  • A bad deal; a rip-off. 

verb
  • To cheat or swindle. 

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