helter-skelter vs upheaval

helter-skelter

noun
  • Confusion or turmoil. 

  • A helical fairground slide. 

adv
  • In confused, disorderly haste. 

adj
  • Carelessly hurried and confused. 

upheaval

noun
  • A sudden violent upset, disruption or convulsion. 

  • Disruptive change, from one state to another. 

  • The process of being heaved upward, especially the raising of part of the earth's crust. 

How often have the words helter-skelter and upheaval occurred in a corpus of books? (source: Google Ngram Viewer )