piebald vs worked

piebald

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

  • Of mixed character, heterogeneous. 

noun
  • An animal with piebald coloration. 

worked

adj
  • Decorated or embellished; embroidered. 

  • Processed in a particular way; prepared via labour. 

  • Designed or executed in a particular manner or to a particular degree. 

  • Prepared so as to demonstrate the steps required. 

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