agony vs bitterness

agony

noun
  • Paroxysm of joy; keen emotion. 

  • Extreme pain. 

  • Violent contest or striving. 

  • The sufferings of Jesus Christ in the garden of Gethsemane. 

  • The last struggle of life; death struggle. 

bitterness

noun
  • The quality of feeling bitter; acrimony, resentment; the quality of exhibiting such feelings. 

  • The quality of eliciting a bitter, humiliating or harsh feeling. 

  • The quality of having a bitter taste. 

  • Harsh cold. 

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