shiv vs stob

shiv

verb
  • To stab someone with a shiv. 

  • To stab someone with anything not normally used as a stabbing weapon. 

noun
  • A knife, especially a makeshift one fashioned from something not normally used as a weapon (like a plastic spoon or a toothbrush). 

  • A particular woody by-product of processing flax or hemp. 

stob

verb
  • To stab. 

  • To make mats with a stob tool. 

  • To roof with stob-thatch. 

noun
  • A small post for supporting paling. 

  • A wedge in coal-mining. 

  • A stick, twig or peg, especially in roofing or matting. 

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