snow goose vs Chen caerulescens

snow goose and Chen caerulescens both are nouns.

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

As nouns, Chen caerulescens is a hypernym of snow goose; that is, Chen caerulescens is a word with a broader meaning than snow goose:

snow goose: blue goose in the white color phase
Chen caerulescens: North American wild goose having dark plumage in summer but white in winter

Other hypernyms of snow goose include blue goose.

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