outskirts vs slub

outskirts

noun
  • The area surrounding a city or town; suburb. 

slub

verb
  • To draw and twist fibers in order to prepare them for spinning. 

noun
  • Fabric fiber produced by slubbing. 

  • A small thickened portion or knot found on linen yarn, caused by defects. 

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