helter-skelter vs to-do

helter-skelter

noun
  • Confusion or turmoil. 

  • A helical fairground slide. 

adj
  • Carelessly hurried and confused. 

adv
  • In confused, disorderly haste. 

to-do

noun
  • A fuss made over something. 

  • A task that has been noted as one that must be completed, especially on a list. 

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