piebald vs streaked

piebald

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

  • Of mixed character, heterogeneous. 

noun
  • An animal with piebald coloration. 

streaked

adj
  • Marred with streaks. 

  • Bearing streaks. 

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