prowess vs string to one's bow

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. 

string to one's bow

noun
  • A skill, ability or resource. 

  • A lover, paramour or suitor. 

How often have the words prowess and string to one's bow occurred in a corpus of books? (source: Google Ngram Viewer )