antediluvial vs antediluvian

antediluvial

adj
  • Of or pertaining to a time before Noah's flood. 

  • Antiquated. 

antediluvian

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

  • Ancient or antiquated. 

  • Extremely dated. 

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

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

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