plunging vs subnormal

plunging

adj
  • Very low-cut. 

  • That descends steeply. 

  • Aimed from higher ground, as fire upon an enemy. 

noun
  • A headlong violent motion like that of a horse trying to throw its rider. 

  • An occurrence of putting or sinking under water or other fluid. 

subnormal

adj
  • Less than normal. 

  • denormal 

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. 

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