cowardliness vs mettle

cowardliness

noun
  • A cowardly action. 

  • The characteristic of being cowardly. 

mettle

noun
  • Good temperament and character. 

  • A quality of endurance and courage. 

adj
  • Spirited, vigorous, stout-hearted. 

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