gobsmacked vs helter-skelter

gobsmacked

adj

  • Flabbergasted, astounded, speechless, overawed. 

helter-skelter

adj

  • Carelessly hurried and confused. 

adv

  • In confused, disorderly haste. 

noun

  • A helical fairground slide. 

  • Confusion or turmoil. 

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