What does "scaup" mean?

Any of three species of small diving duck in the genus Aythya.

What is a synonym for "scaup"?

Common synonyms include: bluebill, broadbill, diving duck, duck, scaup duck.

/skɔːp/ noun

noun ·Rare ·Advanced level

Noun

1
Any of three species of small diving duck in the genus Aythya.
"Or spot gaggles of Canada geese, ducks and scaups flying over schools of bluefish."
2
diving ducks of North America having a bluish-grey bill wordnet
3
Alternative form of scalp (“a bed or stratum of shellfish”). Scotland, alt-of, alternative

"Or spot gaggles of Canada geese, ducks and scaups flying over schools of bluefish."

See scalp (“a bed of oysters or mussels”).