manliness vs mettle

manliness

noun
  • The quality of being manly; the set of qualities, traits and abilities considered appropriate to men (as opposed to women or children); similarity to a man. 

  • Male genitals. 

  • Humanity, the quality of being human. 

mettle

noun
  • Good temperament and character. 

  • A quality of endurance and courage. 

adj
  • Spirited, vigorous, stout-hearted. 

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