Rouen vs. mallard

Rouen

noun

  1. a city in and the capital of Seine-Maritime, in N France, on the Seine: famous cathedral; execution of Joan of Arc 1431.
  2. one of a breed of domestic ducks resembling the wild mallard.

mallard

noun

plural mallards, (especially collectively) mallard.
  1. a common, almost cosmopolitan, wild duck, Anas platyrhynchos, from which the domestic ducks are descended.