duffel vs toolkit

duffel

noun
  • Outfit or supplies, collectively; kit. 

  • A kind of coarse woolen cloth, having a thick nap or frieze. 

toolkit

noun
  • A set of tools kept together, especially comprising all the tools suitable for some particular type of work. 

  • A set of software tools or components. 

  • Instructions to organise a protest. 

  • A set of personal abilities, skills, or resources to draw on. 

  • A set of guidelines or instructions. 

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