butterball vs dipper

butterball and dipper both are nouns.

Word	Noun	Adjective	Verb	Adverb
butterball	Yes	No	No	No
dipper	Yes	No	No	No

As nouns, butterball and dipper are synonyms defined as:

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

Other synonyms of butterball include Bucephela albeola, bufflehead.

butterball (noun)	dipper (noun)
small North American diving duck; males have bushy head plumage	small North American diving duck; males have bushy head plumage
a rotund individual	small stocky diving bird without webbed feet; frequents fast-flowing streams and feeds along the bottom
	a ladle that has a cup with a long handle