deftness vs knack

deftness

noun
  • The characteristic of being deft. 

knack

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

  • A petty contrivance; a toy. 

  • A readiness in performance; aptness at doing something. 

verb
  • To speak affectedly. 

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