lesser scaup vs bluebill

lesser scaup and bluebill both are nouns.

Word	Noun	Adjective	Verb	Adverb
lesser scaup	Yes	No	No	No
bluebill	Yes	No	No	No

As nouns, bluebill is a hypernym of lesser scaup; that is, bluebill is a word with a broader meaning than lesser scaup:

Other hypernyms of lesser scaup include broadbill, scaup, scaup duck.

lesser scaup (noun)	bluebill (noun)
common scaup of North America; males have purplish heads	diving ducks of North America having a bluish-grey bill