ignorance vs inability

ignorance

noun
  • The condition of being uninformed or uneducated; lack of knowledge or information. 

  • Sins committed through ignorance. 

inability

noun
  • Lack of the ability to do something; incapability. 

  • Lack of the option to do something; powerlessness. 

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