piff vs pinhead

piff

noun
  • Piffle; nonsense; rubbish. 

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

adj
  • good or attractive. 

verb
  • To throw something vigorously. 

pinhead

noun
  • A foolish or stupid person. 

  • The head of a pin. (Frequently used in size comparisons.) 

  • A telemark skier. 

  • A newborn cricket used as food for pets. 

  • A human head that is unusually tapered or small, often due to microcephaly, or a person with that trait. Often promoted in freak shows as "human pinheads". 

  • The immature juvenile fruiting body of a mushroom prior to its gills opening. 

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