discern vs mistake

discern

verb
  • To perceive, recognize, or comprehend with the mind; to descry. 

  • To distinguish something as being different from something else; to differentiate. 

  • To detect with the senses, especially with the eyes. 

  • To perceive differences. 

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. 

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