monger vs travelling salesman

monger

noun
  • A dealer in a specific commodity. 

  • A small sea vessel. 

  • A person promoting something undesirable. 

verb
  • To promote something undesirable. 

  • To sell or peddle something 

travelling salesman

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

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