prehistoric vs primal

prehistoric

adj
  • Of or relating to the epoch before written record. 

  • Ancient; very old, outdated, etc. 

primal

adj
  • Being the first in time or in history. 

  • Of greatest importance; primary. 

  • Being one of the pieces of meat initially separated from the carcass during butchering, prior to division into smaller cuts. 

verb
  • To take part in primal therapy. 

noun
  • A primal cut (of meat). 

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