coin vs penny

coin

noun
  • Money in general, not limited to coins. 

  • A piece of currency, usually metallic and in the shape of a disc, but sometimes polygonal, or with a hole in the middle. 

  • A token used in a special establishment like a casino. 

  • That which serves for payment or recompense. 

  • One of the suits of minor arcana in tarot, or a card of that suit. 

  • A cryptocurrency; a cryptocoin. 

  • A corner or external angle. 

  • A small circular slice of food. 

verb
  • To make of a definite fineness, and convert into coins, as a mass of metal. 

  • To make or fabricate (especially a word or phrase). 

  • To acquire rapidly, as money; to make. 

penny

noun
  • Money in general. 

  • In the United Kingdom and Ireland, a unit of currency worth ¹⁄₂₄₀ of a pound sterling or Irish pound before decimalisation, or a copper coin worth this amount. Abbreviation: d. 

  • In the United Kingdom, a unit of currency worth ¹⁄₁₀₀ of a pound sterling, or a copper coin worth this amount. Abbreviation: p. 

  • A unit of nail size, said to be either the cost per 100 nails, or the number of nails per penny. Abbreviation: d. 

  • In various countries, a small-denomination copper or brass coin. 

  • In the US and (formerly) Canada, a one-cent coin, worth ¹⁄₁₀₀ of a dollar. Abbreviation: ¢. 

  • In Ireland, a coin worth ¹⁄₁₀₀ of an Irish pound before the introduction of the euro. Abbreviation: p. 

verb
  • To circumvent the tripping of an electrical circuit breaker by the dangerous practice of inserting a coin in place of a fuse in a fuse socket. 

  • During a meal or as part of a drinking game, to drop a penny in a person's drink such that they must finish it (or some such variation thereof); commonly associated with crewdates at Oxford and swaps at Cambridge. 

  • To jam a door shut by inserting pennies between the doorframe and the door. 

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