bummer vs free rider

bummer

intj
  • Exclamation of annoyance or frustration at a bummer (disappointment). 

noun
  • A disappointment, a pity, a shame. 

  • A lamb (typically the smallest of a multiple birth) which has been abandoned by its mother or orphaned, and as a consequence is raised in part or in whole by humans. 

  • A gay man. 

free rider

noun
  • 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. 

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

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