bast vs filament

bast

noun
  • Fibre made from the phloem of certain plants and used for matting and cord. 

filament

noun
  • A fine thread or wire. 

  • A continuous object, limited in length only by its spool, and not cut to length. 

  • The stalk of a flower stamen, supporting the anther. 

  • Such a wire, as can be heated until it glows, in an incandescent light bulb or a thermionic valve. 

  • A massive, thread-like structure, such as those gaseous ones which extend outward from the surface of the sun, or such as those (much larger) ones which form the boundaries between large voids in the universe. 

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