commissioner vs regent

commissioner

noun
  • An official in charge of a government department, especially a police force. 

  • Someone commissioned to perform certain duties. 

  • A member of a commission. 

  • Someone who commissions something. 

regent

noun
  • The chief executive of a regency 

  • A member of governing board of a college or university; also a governor of the Smithsonian Institute in Washington DC. 

  • One who rules in place of the monarch, especially because the monarch is too young, absent, or disabled. 

  • A member of a municipal or civic body of governors, especially in certain European cities. 

adj
  • Exercising vicarious authority. 

  • Ruling; governing; regnant. 

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