bluebill

Từ điển WordNet v3.1 - WordNet Dictionary

noun

diving ducks of North America having a bluish-grey bill
• Syn:
scaup, scaup duck, broadbill
• Hypernyms:
duck
• Hyponyms:
greater scaup, Aythya marila, lesser scaup, lesser scaup duck, lake duck, Aythya affinis
• Member Holonyms:
Aythya, genus Aythya