canvasback duck vs canvasback

canvasback duck and canvasback both are nouns.

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

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

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

Other synonyms of canvasback duck include Aythya valisineria.

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