caoutchouc vs glair

caoutchouc

noun
  • latex; natural rubber 

glair

noun
  • Any viscous, slimy substance. 

  • Egg white, especially as used in various industrial preparations. 

  • A broadsword fixed on a pike; a kind of halberd. 

verb
  • To smear with egg-white. 

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