ballot box vs scrutiny

ballot box

noun
  • The process or method of voting. 

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

scrutiny

noun
  • An examination by a committee of the votes given at an election, for the purpose of correcting the poll. 

  • Intense study of someone or something. 

  • Thorough inspection of a situation or a case. 

  • A ticket, or little paper billet, on which a vote is written. 

  • An examination of catechumens, in the last week of Lent, who were to receive baptism on Easter Day. 

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