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canvasback vs. redhead

[ kan-vuhs-bak ]
noun,
  1. a North American wild duck, Aythya valisineria, the male of which has a whitish back and a reddish-brown head and neck.
[ red-hed ]
noun
  1. a person having red hair.
  2. an American diving duck, Aythya americana, the male of which has a bright chestnut-red head.