flail vs piff

flail

verb
  • To wave or swing vigorously 

  • To beat using a flail or similar implement. 

  • To thresh. 

  • To move like a flail. 

noun
  • A weapon which has the (usually spherical) striking part attached to the handle with a flexible joint such as a chain. 

  • A tool used for threshing, consisting of a long handle with a shorter stick attached with a short piece of chain, thong or similar material. 

piff

verb
  • To throw something vigorously. 

noun
  • Piffle; nonsense; rubbish. 

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

adj
  • good or attractive. 

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