carr vs peatland

carr

noun
  • A bog or marsh; marshy ground, swampland. 

  • rock 

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

peatland

noun
  • Land with peat soil, such as an active or former bog 

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