abjure vs vow

abjure

verb
  • To renounce upon oath; to forswear; to disavow. 

  • To reject with solemnity; to abandon forever; to repudiate; to disclaim. 

  • To abstain from; to avoid; to shun. 

vow

verb
  • To make a vow regarding (something). 

  • To declare publicly that one has made a vow, usually to show one's determination or to announce an act of retaliation. 

  • To make a vow; to promise. 

noun
  • A solemn promise to perform some act, or behave in a specified manner, especially a promise to live and act in accordance with the rules of a religious order. 

  • A declaration or assertion. 

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