collector vs courier

collector

noun
  • A person who is employed to collect payments. 

  • One holding a Bachelor of Arts in Oxford, formerly appointed to superintend some scholastic proceedings in Lent. 

  • A major sewer which collects sewerage from a number of smaller branch sewers 

  • A person who or thing that collects, or which creates or manages a collection. 

  • A mafioso whose task is to collect protection money from small businesses 

  • The amplified terminal on a bipolar junction transistor. 

  • A compiler of books; one who collects scattered passages and puts them together in one book. 

courier

noun
  • A person who delivers messages. 

  • A company that transports goods. 

  • A user who earns access to a topsite by uploading warez. 

  • A company that delivers messages. 

  • A person who looks after and guides tourists. 

verb
  • To deliver by courier. 

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