beg the question vs prevaricate

beg the question

verb
  • To sidestep or fail to address a question. 

  • To raise or prompt a question. 

  • To engage in the logical fallacy of begging the question (petitio principii). 

prevaricate

verb
  • To shift or turn from direct speech or behaviour; to deviate from the truth; to evade the truth; to waffle or be (intentionally) ambiguous. 

  • To undertake something falsely and deceitfully, with the purpose of defeating or destroying it. 

  • To collude, as where an informer colludes with the defendant, and makes a sham prosecution. 

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