meadow vs swale

meadow

noun
  • Low land covered with coarse grass or rank herbage near rivers and in marshy places by the sea. 

  • A field or pasture; a piece of land covered or cultivated with grass, usually intended to be mown for hay. 

swale

noun
  • A low tract of moist or marshy land. 

  • A long narrow and shallow trough between ridges on a beach, running parallel to the coastline. 

  • Bioswale, a shallow trough dug into the land on contour (horizontally with no slope), whose purpose is to allow water time to percolate into the soil. 

  • A shallow, usually grassy depression sloping downward from a plains upland meadow or level vegetated ridgetop. 

  • A gutter in a candle. 

  • A shallow troughlike depression that's created to carry water during rainstorms or snow melts; a drainage ditch. 

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