amadou vs tinder

amadou

noun
  • A spongy, flammable substance prepared from bracket fungi, formerly used as a styptic and as tinder. 

tinder

noun
  • Small dry sticks and finely-divided fibrous matter etc., used to help light a fire. 

verb
  • To set fire to; torch. 

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