slave-driver vs tenter

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. 

tenter

noun
  • One who takes care of, or tends, machines in a factory; a kind of assistant foreman. 

  • A kind of governor, or regulating device. 

  • A framework upon which cloth is stretched and dried. 

verb
  • To stretch cloth on such a framework. 

  • To admit extension; to be stretchable. 

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