piebald vs variegated

piebald

adj
  • Spotted or blotched, especially in black and white. 

  • Of mixed character, heterogeneous. 

noun
  • An animal with piebald coloration. 

variegated

adj
  • Streaked, spotted, or otherwise marked with a variety of color. 

  • Very colorful. 

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