bolk vs vom

bolk

verb

  • To vomit; retch. 

  • To belch out; give vent to; ejaculate. 

  • To heave. 

  • To belch. 

  • To gush out. 

vom

verb

  • vomit 

noun

  • vomit 

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