intrepid vs spunky

intrepid

adj

  • Fearless; bold; brave. 

spunky

adj

  • Spirited or plucky. 

  • Pertaining to or like spunk (semen). 

  • Stained with semen. 

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