agonizing vs excruciating

agonizing

adj

  • Causing physical or mental agony. 

noun

  • The act of one who agonizes. 

excruciating

adj

  • Causing great pain or anguish, agonizing 

  • Exceedingly intense; extreme 

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