castling vs transposition

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). 

transposition

noun
  • A sequence of moves resulting in a position that may also be reached by another, more common sequence. 

  • A incorporation of the provisions of a European Union directive into a Member State's domestic law. 

  • A shift of a piece of music to a different musical key by adjusting all the notes of the work equally either up or down in pitch. 

  • The act or process of transposing or interchanging. 

verb
  • To transpose 

  • To take on the role of another person 

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