doughtiness vs mettle

doughtiness

noun

  • The quality of being doughty. 

mettle

noun

  • Good temperament and character. 

  • A quality of endurance and courage. 

adj

  • Spirited, vigorous, stout-hearted. 

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