discontent vs frustration

discontent

noun
  • A discontented person; a malcontent. 

  • Dissatisfaction. 

  • A longing for better times or circumstances. 

adj
  • Not content; discontented; dissatisfied. 

verb
  • To deprive of contentment; to make uneasy; to dissatisfy. 

frustration

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

  • A thing that frustrates. 

  • The feeling of annoyance at impassibility from resistance. 

  • 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. 

  • Anger not directed at anything or anyone in particular. 

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