freckle vs stipple

freckle

verb
  • To cover with freckles. 

  • To become covered with freckles. 

noun
  • A small brownish or reddish pigmentation spot on the surface of the skin. 

  • A small sweet consisting of a flattish mound of chocolate covered in hundreds and thousands. 

  • The anus. 

  • Any small spot or discoloration. 

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 freckle and stipple occurred in a corpus of books? (source: Google Ngram Viewer )