priority vs urgency

priority

noun
  • A goal of a person or an organisation. 

  • A superior claim to use by virtue of being validly published at an earlier date. 

  • The quality of being earlier or coming first compared to another thing; the state of being prior. 

  • right of way; The right to pass (an intersection) before other road users 

  • An item's relative importance. 

urgency

noun
  • The quality or condition of being urgent. 

  • Insistence, pressure, urge. 

  • A sudden and compelling need to urinate that is difficult to defer, associated with conditions such as urinary tract infections and overactive bladder. 

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