estimate vs rating

estimate

noun
  • An upper limitation on some positive quantity. 

  • A rough calculation or assessment of the value, size, or cost of something. 

  • A document (or verbal notification) specifying how much a job is likely to cost. 

verb
  • To judge and form an opinion of the value of, from imperfect data. 

  • To calculate roughly, often from imperfect data. 

rating

noun
  • A quantitative measure of the audience of a television program. 

  • An enlisted seaman not a commissioned officer or warrant officer. 

  • An evaluation of status, especially of financial status. 

  • A number, letter, or other mark that refers to the ability of something. 

  • A position on a scale. 

  • A seaman in a warship. 

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