discontent vs spleen

discontent

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

adj
  • Not content; discontented; dissatisfied. 

noun
  • Dissatisfaction. 

  • A longing for better times or circumstances. 

  • A discontented person; a malcontent. 

spleen

verb
  • To annoy or irritate. 

  • To remove the spleen, or, by extension, to gore. 

  • To excise or remove. 

  • To complain; to rail; to vent one's spleen. 

noun
  • A fit of immoderate laughter or merriment. 

  • In vertebrates, including humans, a ductless vascular gland, located in the left upper abdomen near the stomach, which destroys old red blood cells, removes debris from the bloodstream, acts as a reservoir of blood, and produces lymphocytes. 

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