discontentment vs disgruntlement

discontentment

noun
  • A state of dissatisfaction or discontent. 

disgruntlement

noun
  • The state of being disgruntled, usually displayed in a stereotypical form such as frowning and annoyance; the acts of sulky dissatisfaction. 

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