packing vs reinforcement

packing

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

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

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

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

  • The forming of players into a scrum. 

  • 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. 

reinforcement

noun
  • The act, process, or state of reinforcing or being reinforced. 

  • The process whereby a behavior with desirable consequences comes to be repeated. 

  • A small round white sticker placed around a punched hole in a piece of paper to prevent the binder's rings from tearing through the paper. 

  • Additional troops or materiel sent to support a military action. 

  • A thing that reinforces. 

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