merchandiser vs travelling salesman

merchandiser

noun
  • A trader, seller or merchant, especially in the retail trade. 

  • An arcade machine which dispenses prizes to winners. 

travelling salesman

noun
  • A man who travels, often within a certain territory, soliciting orders or selling goods. 

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