must-have vs primal

must-have

adj
  • Essential to own. 

noun
  • An item that one must own, or a feature that is essential to a service, etc. 

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 must-have and primal occurred in a corpus of books? (source: Google Ngram Viewer )