promote vs sell

promote

verb
  • To advocate or urge on behalf of (something or someone); to attempt to popularize or sell by means of advertising or publicity. 

  • To increase the activity of (a catalyst) by changing its surface structure. 

  • To elevate to a higher league. 

  • To raise (someone) to a more important, responsible, or remunerative job or rank. 

  • To move on to a subsequent stage of education. 

  • To encourage, urge or incite. 

  • To exchange (a pawn) for a queen or other piece when it reaches the eighth rank. 

sell

verb
  • To promote a product or service. 

  • To be sold. 

  • To promote a particular viewpoint. 

  • To work as a prostitute. 

  • To betray for money or other things. 

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

  • To trick, cheat, or manipulate someone. 

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

noun
  • An act of selling; sale. 

  • The promotion of an idea for acceptance. 

  • An easy task. 

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