buyer vs costermonger

buyer

noun
  • A person who makes one or more purchases. 

  • A person who purchases items consumed or used as components in the manufacture of products. 

  • A person who purchases items for resale in a retail establishment. 

costermonger

noun
  • A trader who sells fruit and vegetables from a cart or barrow in the street. 

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