parchment vs parchment paper

parchment

noun
  • Stiff paper imitating that material. 

  • A document made on such material. 

  • The creamy to tanned color of parchment. 

  • Material, made from the polished skin of a calf, sheep, goat or other animal, used like paper for writing. 

  • The envelope of the coffee grains, inside the pulp. 

  • A diploma (traditionally written on parchment). 

parchment paper

noun
  • Cellulose-based paper used in baking as a disposable non-stick surface. 

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