dealer vs dispatcher

dealer

noun
  • One who deals in goods, especially automobiles; a middleman. 

  • A particular type of stock broker or trader. 

  • A drug dealer, one who peddles illicit drugs. 

  • The person who deals the cards in a card game. 

  • One who deals or metes out anything. 

dispatcher

noun
  • In a transportation organization, a person who controls the movements of vehicles. 

  • Any die used for cheating, whether fraudulently weighted or bearing duplicate numbers. 

  • A piece of software responsible for assigning priorities and resources to tasks waiting to be scheduled. 

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