fleck vs stipple

fleck

verb
  • To mark (something) with small spots. 

noun
  • A lock, as of wool. 

  • A flake. 

  • A small spot or streak; a speckle. 

  • A small amount. 

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