fossil vs longbeard

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  • An extremely old or outdated person.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  • Anything extremely old, extinct, or outdated.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. 

longbeard

noun
  • Synonym of greybeard (“an old man”) 

  • A man with a long beard. 

  • Synonym of greybeard (“experienced long-time member of a group”) 

  • Synonym of greybeard (“a bellarmine”) 

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