free rider vs profiteer

free rider

noun
  • One who obtains benefit from a public good without paying for it directly. 

  • A worker at an open shop who is able to enjoy the benefits negotiated by a union without being a member of the union. 

  • Someone who obtains goods or services legally without paying. 

profiteer

noun
  • One who makes an unreasonable profit not justified by cost or risk, a rent-seeker. 

verb
  • To make an unreasonable profit not justified by cost or risk. 

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