ballot box vs election

ballot box

noun
  • The process or method of voting. 

  • A sealed box with a slit, into which a voter puts a completed voting slip. 

election

noun
  • A process of choosing a leader, members of parliament, councillors, or other representatives by popular vote. 

  • In Calvinism, God's predestination of saints including all of the elect. 

  • The choice of a leader or representative by popular vote. 

  • An option that is selected. 

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