big house vs workhouse

big house

noun
  • Prison, jail. 

  • Used other than figuratively or idiomatically: see big, house. 

  • A religious building of the Delaware Indians, representing the cosmos. 

workhouse

noun
  • A prison in which the sentence includes manual labour. 

  • An institution for the poor homeless, funded by the local parish, where the able-bodied were required to work. 

verb
  • To place (a person) in the workhouse (institution for the poor). 

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