copying vs onomatopoeic

copying

noun
  • the practice of making one or more copies 

  • an instance of the making of a copy 

onomatopoeic

adj
  • Having the property of onomatopoeia. 

  • Of or relating to onomatopoeia. 

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