pusillanimity vs spinelessness

pusillanimity

noun
  • The quality or state of being pusillanimous; the vice of being timid and cowardly, and thus not living up to one's full potential; pusillanimousness. 

spinelessness

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

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