roof vs windrow

roof

noun
  • An overhanging rock wall. 

  • The external covering at the top of a building. 

  • The top external level of a building. 

  • The upper part of a cavity. 

  • The surface or bed of rock immediately overlying a bed of coal or a flat vein. 

verb
  • To cover or furnish with a roof. 

  • To traverse buildings by walking or climbing across their roofs. 

  • To put into prison, to bird. 

  • To shelter as if under a roof. 

windrow

noun
  • A ridge or berm at a perimeter 

  • 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 long snowbank along the side of a road. 

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

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

  • 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 roof and windrow occurred in a corpus of books? (source: Google Ngram Viewer )