castling vs traffic

castling

noun
  • 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). 

  • 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. 

traffic

verb
  • To exchange in traffic; to effect by a bargain or for a consideration. 

  • To pass goods and commodities from one person to another for an equivalent in goods or money; to buy or sell goods. 

  • To trade meanly or mercenarily; to bargain. 

noun
  • The amount of attention paid to a particular printed page etc. in a publication. 

  • Commercial transportation or exchange of goods, or the movement of passengers or people. 

  • In CB radio, formal written messages relayed on behalf of others. 

  • Exchange or flux of information, messages or data, as in a computer or telephone network. 

  • Commodities of the market. 

  • Moving pedestrians or vehicles, or the flux or passage thereof. 

  • Illegal trade or exchange of goods, often drugs. 

adj
  • congested 

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