leaflet vs proofreader

leaflet

noun
  • A small sheet of paper containing information, used for dissemination of said information, often an advertisement. 

  • One of the components of a compound leaf. 

  • A flap of a valve of a heart or blood vessel. 

  • A small plant leaf. 

verb
  • To distribute leaflets to. 

  • To distribute leaflets. 

proofreader

noun
  • A person whose occupation is to proofread. 

  • A person who proofreads. 

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