fiercely vs hysterically

fiercely

adv
  • In a fierce manner. 

  • extremely; to a large degree 

  • fiercely competitive 

hysterically

adv
  • In a hysterical manner; showing signs of hysteria. 

  • With, or causing, very much laughter. 

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