ignorance vs knack

ignorance

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

  • Sins committed through ignorance. 

knack

verb
  • To speak affectedly. 

noun
  • A petty contrivance; a toy. 

  • A readiness in performance; aptness at doing something. 

  • Something performed, or to be done, requiring aptness and dexterity. 

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