Aythya marila vs broadbill

Aythya marila and broadbill both are nouns.

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

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

Aythya marila: large scaup of North America having a greenish iridescence on the head of the male
broadbill: diving ducks of North America having a bluish-grey bill

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

Aythya marila (noun)	broadbill (noun)
large scaup of North America having a greenish iridescence on the head of the male	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