bravery vs spinelessness

bravery

noun
  • Being brave, courageousness. 

  • A brave act. 

  • Splendor, magnificence. 

spinelessness

noun
  • The state or quality of being spineless (not having a spine (literally or figuratively)); cowardice. 

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