prowess vs skill set

prowess

noun
  • Skillfulness and manual ability; adroitness or dexterity. 

  • An act of distinguished bravery or courage; a heroic deed. 

  • Distinguished bravery or courage, especially in battle; heroism. 

  • An act of adroitness or dexterity. 

skill set

noun
  • A set of skills. 

  • The skills needed to accomplish a specified task or perform a given function. 

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