adjure vs plead

adjure

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

  • To issue a formal command. 

plead

verb
  • To beg, beseech, or implore. 

  • To present (an argument or a plea), especially in a legal case. 

  • To offer by way of excuse. 

  • To discuss by arguments. 

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