dealer vs introduction agency

dealer

noun
  • A particular type of stock broker or trader. 

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

  • 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. 

introduction agency

noun
  • A company which arranges dates and marriages between men and women, often from different countries. 

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