disturbance vs reassurance

disturbance

noun
  • The act of disturbing, being disturbed. 

  • A noisy commotion that causes a hubbub or interruption. 

  • Something that disturbs. 

  • An interruption of that which is normal or regular. 

  • A serious mental imbalance or illness. 

reassurance

noun
  • The feeling of being reassured, of having confidence restored, of having apprehensions dispelled. 

  • The act of confirming someone's opinion or impression. 

  • Reinsurance. 

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