Aythya affinis vs broadbill

Aythya affinis and broadbill both are nouns.

Word	Noun	Adjective	Verb	Adverb
Aythya affinis	Yes	No	No	No
broadbill	Yes	No	No	No

As nouns, broadbill is a hypernym of Aythya affinis; that is, broadbill is a word with a broader meaning than Aythya affinis:

Other hypernyms of Aythya affinis include bluebill, scaup, scaup duck.

Aythya affinis (noun)	broadbill (noun)
common scaup of North America; males have purplish heads	small birds of the Old World tropics having bright plumage and short wide bills
	freshwater duck of the Northern Hemisphere having a broad flat bill
	diving ducks of North America having a bluish-grey bill
	tropical American heron related to night herons