mistake vs retouch

mistake

verb
  • To understand wrongly, taking one thing or person for another. 

noun
  • An error; a blunder. 

  • A pitch which was intended to be pitched in a hard-to-hit location, but instead ends up in an easy-to-hit place. 

retouch

verb
  • To colour the roots of hair to match hair previously coloured. 

  • To modify a flint tool by making secondary flaking along the cutting edge. 

  • To improve something (especially a photograph), by adding or correcting details, or by removing flaws. 

noun
  • The act of retouching. 

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