Bucephela clangula vs whistler

Bucephela clangula and whistler both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bucephela clangula	Yes	No	No	No
whistler	Yes	No	No	No

As nouns, Bucephela clangula and whistler are synonyms defined as:

Bucephela clangula and whistler: large-headed swift-flying diving duck of Arctic regions

Other synonyms of Bucephela clangula include goldeneye.

Bucephela clangula (noun)	whistler (noun)
large-headed swift-flying diving duck of Arctic regions	Australian and southeastern Asian birds with a melodious whistling call
	large-headed swift-flying diving duck of Arctic regions
	large North American mountain marmot
	someone who makes a loud high sound