palette knife vs spackle

palette knife

noun
  • In painting, a small, edge-less, more or less flexible steel blade used to mix paint on a palette and sometimes to apply paint to a surface. 

spackle

noun
  • A plastic paste meant for filling cracks and holes in plaster. 

  • Any powder (originally containing gypsum plaster and glue) that when mixed with water forms a plastic paste, which is used to fill cracks and holes in plaster. 

  • A paste-like substance that fills a gap. 

verb
  • To fill gaps with something, as if spackling; to speckle 

  • To fill or repair with a plastic paste. 

  • To fill cracks or holes with a spackle. 

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