fossil vs whitebeard

fossil

noun
  • An extremely old or outdated person. 

  • The mineralized remains of an animal or plant. 

  • Any preserved evidence of ancient life, including shells, imprints, burrows, coprolites, and organically-produced chemicals. 

  • Anything extremely old, extinct, or outdated. 

  • A fossil word. 

whitebeard

noun
  • An old man; a greybeard. 

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