billow vs windrow

billow

noun
  • A large wave, swell, surge, or undulating mass of something, such as water, smoke, fabric or sound 

verb
  • To surge or roll in billows. 

  • To swell out or bulge. 

windrow

noun
  • A similar streak of seaweed etc on the surface of the sea formed by Langmuir circulation. 

  • The green border of a field, dug up in order to carry the earth onto other land to improve it. 

  • A line of snow left behind by the edge of a snowplow’s blade. 

  • A ridge or berm at a perimeter 

  • A long snowbank along the side of a road. 

  • A line of leaves etc heaped up by the wind. 

  • A line of gravel left behind by the edge of a grader’s blade. 

  • A row of cut grain or hay allowed to dry in a field. 

verb
  • To arrange (e.g. new-made hay) in lines or windrows. 

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