knobhead vs piff

knobhead

noun
  • A fool; an idiot; a contemptible person. 

  • The glans penis 

piff

noun
  • Piffle; nonsense; rubbish. 

verb
  • To throw something vigorously. 

adj
  • good or attractive. 

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

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