sea duck

Từ điển WordNet v3.1 - WordNet Dictionary

noun

any of various large diving ducks found along the seacoast: eider;
scoter;
merganser
• Hypernyms:
duck
• Hyponyms:
eider, eider duck, scoter, scooter, old squaw,
oldwife, Clangula hyemalis, merganser, fish duck, sawbill, sheldrake