betterness vs elderdom

betterness

noun
  • The state or quality of being better; superiority. 

  • The result or product of being better. 

  • The amount by which a precious metal exceeds the standard of fineness. 

elderdom

noun
  • Preeminence; superiority. 

  • The role or influence of an elder or elders. 

  • The authority, rule, or office of an elder. 

  • The state of being an elder, or of being older; elderhood. 

  • Authority; dominion. 

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