disk vs stob

disk

verb
  • To harrow. 

  • To move towards, or operate at, zero blade pitch, orienting the propeller blades face-on to the oncoming airstream and maximising the drag generated by the propeller. 

noun
  • A disc - either a CD-ROM, an audio CD, a DVD or similar removable storage medium. 

  • A ring- or cup-shaped enlargement of the flower receptacle or ovary that bears nectar or, less commonly, the stamens. 

  • Something resembling a disk. 

  • A type of harrow. 

  • A thin, flat, circular plate or similar object. 

  • An intervertebral disc 

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 disk and stob occurred in a corpus of books? (source: Google Ngram Viewer )