primal vs primeval

primal

adj
  • Of greatest importance; primary. 

  • Being the first in time or in history. 

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

noun
  • A primal cut (of meat). 

verb
  • To take part in primal therapy. 

primeval

adj
  • Primary; original. 

  • Primitive. 

  • Belonging to the first ages. 

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