spunk vs uncertainty

spunk

noun
  • An attractive person (normally male). 

  • Touchwood; tinder. 

  • Courage; spirit; mettle; determination. 

  • Semen. 

verb
  • To ejaculate. 

  • To waste (money etc.). 

uncertainty

noun
  • Doubt; the condition of being uncertain or without conviction. 

  • A parameter that measures the dispersion of a range of measured values. 

  • Something uncertain or ambiguous. 

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