antediluvian vs eldern

antediluvian

adj
  • Ancient or antiquated. 

  • Extremely dated. 

  • Pertaining or belonging to the time period prior to a great or destructive flood or deluge. 

  • Pertaining or belonging to the time prior to Noah's Flood. 

noun
  • One who lived prior to Noah's Flood. 

eldern

adj
  • Not new; old; ancient. 

  • Elder; elderly; aged; old. 

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