bowk vs keck

bowk

verb
  • To vomit. 

  • To belch, to burp. 

keck

verb
  • To heave or retch as if to vomit. 

noun
  • animal dung 

  • The cow parsley (Anthriscus sylvestris). 

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