helter-skelter vs unrest

helter-skelter

noun
  • Confusion or turmoil. 

  • A helical fairground slide. 

adv
  • In confused, disorderly haste. 

adj
  • Carelessly hurried and confused. 

unrest

noun
  • A state of trouble, confusion and turbulence, especially in a political context; a time of riots, demonstrations and protests. 

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