sullying vs warping

sullying

noun
  • The process by which something is sullied or made dirty. 

warping

noun
  • An action or motion that warps or twists. 

  • The art or occupation of preparing warp or webs for the weaver. 

  • The practice of flooding agricultural land with turbid river water to add sediment to the soil. 

  • the deformation of the Earth's crust over a large area 

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