capability vs sufficiency

capability

noun
  • the power or ability to generate an outcome 

  • A digital token allowing a user or process to interact in a specified way with an object that is subject to access control. 

sufficiency

noun
  • The quality or condition of being sufficient. 

  • An adequate amount. 

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