filament vs sisal

filament

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

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

  • A fine thread or wire. 

  • 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. 

sisal

noun
  • The fibre of the plant. 

  • A sisal mat. 

  • A Central American plant, Agave sisalana, cultivated for its sword-shaped leaves that yield fibers used for rope. 

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