cameo vs silver-grey

cameo

noun
  • A piece of jewelry, etc., carved in relief. 

  • A single very brief appearance, especially by a prominent celebrity in a movie or song. 

verb
  • To appear in a cameo role. 

silver-grey

noun
  • A shiny pale grey colour. 

adj
  • Of a shiny pale grey colour. 

How often have the words cameo and silver-grey occurred in a corpus of books? (source: Google Ngram Viewer )