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noun
Any of various large diving ducks found along the seacoast: eider; scoter; merganser.
is a specific kind of: duck.
is a broader term that covers: eider, eider duck | scooter, scoter | Clangula hyemalis, old squaw, oldwife | fish duck, merganser, sawbill, sheldrake.
Find more on sea duck elsewhere: etymology - rhymes - Wikipedia.
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