cumshaw vs knack

cumshaw

noun
  • A gratuity or tip as thanks for a service 

verb
  • To give or make a present to. 

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 cumshaw and knack occurred in a corpus of books? (source: Google Ngram Viewer )