pimple vs stipple

pimple

verb
  • To develop pimples 

noun
  • Scotch (whisky) 

  • An inflamed (raised and colored) spot on the surface of the skin that is usually painful and fills with pus. 

  • An annoying person. 

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