mister vs sir

mister

noun
  • A title conferred on an adult male, usually when the name is unknown. Also used as a term of address, often by a parent to a young child. 

  • A device that makes or sprays mist. 

verb
  • To address by the title of "mister". 

sir

noun
  • A respectful term of address to an adult male (often older), especially if his name or proper title is unknown. 

  • A man of a higher rank or position. 

  • to a teacher. 

  • to a knight or other low member of the peerage. 

  • to a superior military officer. 

  • A respectful term of address to a man of higher rank or position 

verb
  • To address (someone) using "sir". 

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