boat-billed heron vs broadbill

boat-billed heron and broadbill both are nouns.

Word	Noun	Adjective	Verb	Adverb
boat-billed heron	Yes	No	No	No
broadbill	Yes	No	No	No

As nouns, boat-billed heron and broadbill are synonyms defined as:

boat-billed heron and broadbill: tropical American heron related to night herons

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

boat-billed heron (noun)	broadbill (noun)
tropical American heron related to night herons	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