jigsaw vs toughie

jigsaw

noun
  • Something that can be compared to a jigsaw puzzle. 

  • A power saw with fine teeth and a narrow blade which can cut curves in wood or metal. 

  • A jigsaw puzzle. 

verb
  • To cut something using a jigsaw. 

toughie

noun
  • Something that is tough, or difficult. 

  • Someone or something that is strong and resilient. 

  • A tough; Someone or something that acts as a thug or bully. 

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