instrumental vs primal

instrumental

adj
  • essential or central; of great importance or relevance. 

  • Pertaining to, made by, or prepared for an instrument, especially a musical instrument (rather than the human voice). 

  • Applied to a case expressing means or agency, generally indicated in English by by or with with the objective. 

  • Serving as an instrument, medium, means, or agency. 

noun
  • The instrumental case. 

  • A composition written or performed without lyrics, sometimes using a lead instrument to replace vocals. 

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. 

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