lesser scaup duck vs bluebill

lesser scaup duck and bluebill both are nouns.

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

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

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

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