Chen caerulescens vs blue goose

Chen caerulescens and blue goose both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chen caerulescens	Yes	No	No	No
blue goose	Yes	No	No	No

As nouns, Chen caerulescens and blue goose are synonyms defined as:

Chen caerulescens and blue goose: North American wild goose having dark plumage in summer but white in winter

Chen caerulescens (noun)	blue goose (noun)
North American wild goose having dark plumage in summer but white in winter	North American wild goose having dark plumage in summer but white in winter