abjure vs retain

abjure

verb
  • To abstain from; to avoid; to shun. 

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

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

retain

verb
  • To hold back (a pupil) instead of allowing them to advance to the next class or year. 

  • To employ by paying a retainer. 

  • To keep in one's pay or service. 

  • To keep in possession or use. 

  • To hold secure. 

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