packing vs padding

packing

noun
  • Material used to fill in the space around something, especially to make a piston etc. watertight or airtight. 

  • The gathering of birds, animals etc. into a pack. 

  • Material used to wrap a product for sale etc.; packaging. 

  • The forming of players into a scrum. 

  • The action of putting things together, especially of putting clothes into a suitcase for a journey. 

  • Special material used to fill containers or vessels for certain chemically related applications. 

  • A fee charged to cover the costs of packaging. 

  • The spatial arrangement of objects, items or constituent parts. 

padding

noun
  • Soft filling material used in cushions etc. 

  • Extra characters such as spaces added to a record to fill it out to a fixed length. 

  • Extraneous text added to a message for the purpose of concealing its beginning, ending, or length. 

  • Anything of little value used to fill up space. 

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