Devil's Island vs workhouse

Devil's Island

name
  • Former name of Bermuda. An archipelago in North America, in the Atlantic 

  • An island in the Salvation Islands, Caribbean, Atlantic 

  • A former settlement, a penal colony in Devil's Island, Salvation Islands, Kourou, French Guyana, South America, in the Caribean 

workhouse

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

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. 

How often have the words Devil's Island and workhouse occurred in a corpus of books? (source: Google Ngram Viewer )