helter-skelter vs intentional

helter-skelter

adj
  • Carelessly hurried and confused. 

adv
  • In confused, disorderly haste. 

noun
  • A helical fairground slide. 

  • Confusion or turmoil. 

intentional

adj
  • Done with intent. 

  • Intended or planned; done deliberately or voluntarily. 

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