minister vs slave-driver

minister

noun
  • A servant; a subordinate; an officer or assistant of inferior rank; hence, an agent, an instrument. 

  • A person who is trained to preach, to perform religious ceremonies, and to afford pastoral care at a Protestant church. 

  • A politician who heads a ministry (national or regional government department for public service). 

  • In diplomacy, the rank of diplomat directly below ambassador. 

verb
  • To attend to (the needs of); to tend; to take care (of); to give aid; to give service. 

  • to function as a clergyman or as the officiant in church worship 

slave-driver

noun
  • An overseer of slaves at work; a person who puts slaves to work. 

  • An employer who demands excessive amounts of work from employees. 

How often have the words minister and slave-driver occurred in a corpus of books? (source: Google Ngram Viewer )