lack vs readiness

lack

noun
  • A deficiency or need (of something desirable or necessary); an absence, want. 

verb
  • To be short (of or for something). 

  • To be without, not to have, to need, to require. 

readiness

noun
  • Willingness. 

  • The state or degree of being ready; preparedness. 

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