whistler vs genus Bucephala

whistler and genus Bucephala both are nouns.

Word	Noun	Adjective	Verb	Adverb
whistler	Yes	No	No	No
genus Bucephala	Yes	No	No	No

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