sere vs silvered

sere

noun
  • A natural succession of animal or plant communities in an ecosystem, especially a series of communities succeeding one another from the time a habitat is unoccupied to the point when a climax community is achieved. 

silvered

adj
  • Coated with silver, made reflective or shiny by application of metal. 

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