oddball vs subnormal

oddball

noun
  • An eccentric or unusual person. 

  • A deviant stimulus that appears among repetitive stimuli during an experiment, to trigger an event-related potential in the participant. 

adj
  • Exotic, not mainstream. 

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 oddball and subnormal occurred in a corpus of books? (source: Google Ngram Viewer )