buckram vs unsupple

buckram

verb
  • To stiffen with or as if with buckram. 

noun
  • A coarse cloth of cotton, linen or hemp, stiffened with size or glue, used in bookbinding to cover and protect the books, in garments to keep them in the form intended, and for wrappers to cover merchandise. 

  • A plant, Allium ursinum, also called ramson, wild garlic, or bear garlic. 

unsupple

adj
  • Not supple. 

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