discontent vs irritation

discontent

noun
  • Dissatisfaction. 

  • A longing for better times or circumstances. 

  • A discontented person; a malcontent. 

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

adj
  • Not content; discontented; dissatisfied. 

irritation

noun
  • The state of being irritated 

  • A things or person that annoys 

  • A condition of morbid excitability or oversensitiveness of an organ or part of the body; a state in which the application of ordinary stimuli produces pain or excessive or vitiated action. 

  • The act of irritating or annoying 

  • a state of inflammation or painful reaction to allergy or cell-lining damage. 

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