buy vs sell

buy

verb
  • To obtain (something) in exchange for money or goods. 

  • To make a purchase or purchases, to treat (for a drink, meal or gift) 

  • To make a bluff, usually a large one. 

  • To bribe. 

  • To be equivalent to in value. 

  • To obtain, especially by some sacrifice. 

  • to accept as true; to believe 

noun
  • Something which is bought; a purchase. 

sell

verb
  • To transfer goods or provide services in exchange for money. 

  • To be sold. 

  • To promote a particular viewpoint. 

  • To work as a prostitute. 

  • To betray for money or other things. 

  • To promote a product or service. 

  • To pretend that an opponent's blows or maneuvers are causing legitimate injury; to act. 

  • To trick, cheat, or manipulate someone. 

noun
  • An act of selling; sale. 

  • The promotion of an idea for acceptance. 

  • An easy task. 

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