goldeneye vs whistler

goldeneye and whistler both are nouns.

Word	Noun	Adjective	Verb	Adverb
goldeneye	Yes	No	No	No
whistler	Yes	No	No	No

As nouns, goldeneye and whistler are synonyms defined as:

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

Other synonyms of goldeneye include Bucephela clangula.

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