combined vs piled

combined

adj
  • Resulting from the addition of several sources, parts, elements, aspects, etc. united together. 

piled

adj
  • Formed from a pile or fagot. 

  • Having a pile or point; pointed. 

  • Having a pile or nap. 

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