glade vs morass

glade

noun
  • An open passage through a wood; a grassy open or cleared space in a forest. 

  • An everglade. 

  • An open space in the ice on a river or lake. 

  • A bright surface of ice or snow. 

morass

noun
  • A tract of soft, wet ground; a marsh; a fen. 

  • Anything that entraps or makes progress difficult. 

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