dud vs subnormal

dud

noun
  • A loser; an unlucky person. 

  • A lottery ticket that does not give a payout. 

  • A failure of any kind. 

  • A device or machine that is useless because it does not work properly or has failed to work, such as a bomb, or explosive projectile. 

subnormal

noun
  • A person whose abilities are less than normal. 

  • That part of the axis of a curved line which is intercepted between the ordinate and the normal. 

adj
  • denormal 

  • Less than normal. 

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