colourant vs freckle

colourant

noun
  • A pigment, dye etc added to something to change its colour or hue 

freckle

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. 

verb
  • To become covered with freckles. 

  • To cover with freckles. 

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