Pinhead vs specimen

Pinhead

noun
  • A member of the Provisional IRA. 

specimen

noun
  • An eligible man. 

  • An individual instance that represents a class; an example. 

  • A banknote printed for distribution to central banks to aid in the recognition of banknotes from a country other than their own 

  • A sample, especially one used for diagnostic analysis. 

  • A postage stamp sent to postmasters and postal administrations so that they are able to identify valid stamps and to avoid forgeries 

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