appraisal vs ballot box

appraisal

noun
  • The act or process of developing an opinion of value. 

  • A judgment or assessment of the value of something, especially a formal one. 

ballot box

noun
  • The process or method of voting. 

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

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