carr vs everglade

carr

noun
  • A marsh or fen on which low trees or bushes grow; a marshy woodland. 

  • rock 

  • A bog or marsh; marshy ground, swampland. 

everglade

noun
  • A tract of marshland, especially one containing clumps of sawgrass and hammocks of vegetation 

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