lea vs muskeg

lea

noun
  • An open field, meadow. 

  • Any of several measures of yarn; for linen, 300 yards (275 m); for cotton, 120 yards (110 m). 

  • A set of warp threads carried by a loop of the heddle. 

muskeg

noun
  • A terrain composed of peat bog with tussocky meadow and woody vegetation including spruce. 

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