canvasback vs canvasback duck

canvasback and canvasback duck both are nouns.

Word	Noun	Adjective	Verb	Adverb
canvasback	Yes	No	No	No
canvasback duck	Yes	No	No	No

As nouns, canvasback and canvasback duck are synonyms defined as:

canvasback and canvasback duck: North American wild duck valued for sport and food

Other synonyms of canvasback include Aythya valisineria.

canvasback (noun)	canvasback duck (noun)
North American wild duck valued for sport and food	North American wild duck valued for sport and food