apropos vs primal

apropos

adj
  • Of an appropriate or pertinent nature. 

  • by the way, incidental 

prep
  • Regarding or concerning. 

adv
  • To the purpose; appropriately. 

  • By the way. 

  • Timely; at a good time. 

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. 

verb
  • To take part in primal therapy. 

noun
  • A primal cut (of meat). 

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