#coin  a metal piece (usually a disc) used as money
  supertype:  specie__coinage__mintage__metal_money__metalmoney  coins collectively
  subtype:  change.coin  bawbee  bezant  ducat  real  piece_of_eight  shilling  crown.coin  half_crown  dime  nickel  quarter.coin  half_dollar  halfpenny  penny.coin  tenpence  twopence  threepence  fourpence  fivepence  sixpence  eightpence  ninepence  dollar.coin  eagle.coin  half_eagle  guinea  farthing  doubloon  louis_d'or  medallion.coin  stater.coin  sou
  part:  head.obverse  (usually plural) an obverse side of a coin that bears the representation of a person's head; "call heads or tails!"
  part:  obverse.side  the side of a coin or medal bearing the principal stamp or design
  part:  reverse.side__verso  the side of a coin or medal that does not bear the principal design
  part:  tail.reverse  (usually plural) the reverse side of a coin that does not bear the representation of a person's head

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