broadbill vs boatbill

broadbill and boatbill both are nouns.

Word	Noun	Adjective	Verb	Adverb
broadbill	Yes	No	No	No
boatbill	Yes	No	No	No

As nouns, broadbill and boatbill are synonyms defined as:

Other synonyms of broadbill include boat-billed heron, Cochlearius cochlearius.

broadbill (noun)	boatbill (noun)
small birds of the Old World tropics having bright plumage and short wide bills	tropical American heron related to night herons
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