adjure vs entreat

adjure

verb
  • To earnestly appeal to or advise; to charge solemnly. 

  • To issue a formal command. 

entreat

verb
  • To treat with, or in respect to, a thing desired; hence, to ask for earnestly. 

  • To beseech or supplicate (a person); to prevail upon by prayer or solicitation; to try to persuade. 

noun
  • An entreaty. 

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