Bucephela albeola vs butterball

Bucephela albeola and butterball both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bucephela albeola	Yes	No	No	No
butterball	Yes	No	No	No

As nouns, Bucephela albeola and butterball are synonyms defined as:

Bucephela albeola and butterball: small North American diving duck; males have bushy head plumage

Other synonyms of Bucephela albeola include bufflehead, dipper.

Bucephela albeola (noun)	butterball (noun)
small North American diving duck; males have bushy head plumage	small North American diving duck; males have bushy head plumage
	a rotund individual