intendment vs mistake

intendment

noun
  • the sense in which the legal system interprets something, especially the intention of legislation 

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 intendment and mistake occurred in a corpus of books? (source: Google Ngram Viewer )