piff vs whew

piff

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

adj
  • good or attractive. 

verb
  • To throw something vigorously. 

noun
  • Piffle; nonsense; rubbish. 

whew

intj
  • An expression of amazement or surprise. 

  • An expressive sound made indicating the release of one's inner tension; the release of breath; an expression of relief. 

verb
  • To whistle with a shrill pipe, like a plover. 

  • To bustle about. 

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