anguish vs ruefulness

anguish

noun

  • Extreme pain, either of body or mind; excruciating distress. 

verb

  • To cause to suffer pain. 

  • To suffer pain. 

ruefulness

noun

  • The property of being rueful. 

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