piff vs tremble

piff

verb
  • To throw something vigorously. 

intj
  • An exclamation of annoyance or contempt; pish; pshaw. 

noun
  • Piffle; nonsense; rubbish. 

adj
  • good or attractive. 

tremble

verb
  • To shake, quiver, or vibrate. 

  • To fear; to be afraid. 

noun
  • A shake, quiver, or vibration. 

How often have the words piff and tremble occurred in a corpus of books? (source: Google Ngram Viewer )