piff vs pshaw

piff

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

verb
  • To throw something vigorously. 

adj
  • good or attractive. 

noun
  • Piffle; nonsense; rubbish. 

pshaw

intj
  • Indicating disapproval, scoffery, irritation, impatience or disbelief. 

verb
  • To express disgust or contempt by saying "pshaw". 

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