dapple vs stipple

dapple

verb
  • To mark or become marked with mottling or spots. 

adj
  • Having a mottled or spotted skin or coat, dappled. 

noun
  • A mottled marking, usually in clusters. 

  • An animal with a mottled or spotted skin or coat. 

stipple

verb
  • To use small dots to give the appearance of shading to. 

noun
  • The use of small dots that give the appearance of shading; the dots thus used. 

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