moss vs verdigris

moss

verb
  • To cover (something) with moss. 

  • To become covered with moss. 

noun
  • Any of various small, green, seedless plants growing on the ground or on the surfaces of trees, stones, etc.; now specifically, a plant of the phylum Bryophyta (formerly division Musci). 

  • A bog; a fen. 

  • A kind or species of such plants. 

  • Any alga, lichen, bryophyte, or other plant of seemingly simple structure. 

verdigris

verb
  • To cover, or coat, with verdigris. 

noun
  • A blue-green patina or rust that forms on copper-containing metals. 

  • The colour of this patina or material. 

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