helter-skelter vs pell-mell

helter-skelter

adv
  • In confused, disorderly haste. 

noun
  • A helical fairground slide. 

  • Confusion or turmoil. 

adj
  • Carelessly hurried and confused. 

pell-mell

adv
  • In haste and chaos; uncontrolledly, confusedly. 

adj
  • Hasty and uncontrolled. 

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