frustration vs setback

frustration

noun
  • The feeling of annoyance at impassibility from resistance. 

  • A thing that frustrates. 

  • The state of contract that allows a party to back away from its contractual obligations due to (unforeseen) radical changes to the nature of the thing a party has been obligated to. 

  • The act of frustrating, or the state, or an instance of being frustrated. 

  • Anger not directed at anything or anyone in particular. 

setback

noun
  • An obstacle, delay, disadvantage, blow (an adverse event which retards or prevents progress towards a desired outcome) 

  • An offset to the temperature setting of a thermostat to cover a period when more or less heating is required than usual. 

  • A step-like recession in a wall. 

  • The required distance between a structure and a road. 

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