erratically vs helter-skelter

erratically

adv
  • In an erratic manner; unsteadily or randomly, unpredictably. 

helter-skelter

adv
  • In confused, disorderly haste. 

noun
  • A helical fairground slide. 

  • Confusion or turmoil. 

adj
  • Carelessly hurried and confused. 

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