alderman vs half-crown

alderman

noun
  • A member of a municipal legislative body in a city or town. 

  • A long pipe for smoking. 

  • A potbelly, paunch. 

half-crown

noun
  • A pre-decimal coin used in Britain, Ireland and New Zealand, equivalent to 30 pence or two shillings and six pence. 

How often have the words alderman and half-crown occurred in a corpus of books? (source: Google Ngram Viewer )