piff vs pish

piff

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

verb
  • To throw something vigorously. 

adj
  • good or attractive. 

noun
  • Piffle; nonsense; rubbish. 

pish

intj
  • Expressing disdain. 

noun
  • A sibilant noise (e.g. "psshh") made by birders and ornithologists to attract small birds. 

verb
  • To try to attract birds by making a sibilant noise (e.g. "psshh"). 

  • To express contempt. 

adj
  • Of poor quality; very bad. 

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