berserk vs maniacally

berserk

noun

  • Synonym of berserker (“a Norse warrior who fought in a frenzy”) 

adj

  • Furiously, injuriously, or maniacally violent or out of control. 

  • Bizarre; weird. 

  • Wildly joyous; ecstatic. 

maniacally

adv

  • In a maniacal manner; frantically. 

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