freight wagon vs freightwagon

freight wagon

noun
  • A railroad car used to carry freight 

  • American spelling of freightwagon 

freightwagon

noun
  • Any vehicle, such as a cart, wagon, lorry, truck, or boxcar, used for carrying or transporting goods; a cargo truck. 

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