boat-billed heron vs boatbill

boat-billed heron and boatbill both are nouns.

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

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

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

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

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