snow goose vs blue goose

snow goose and blue goose both are nouns.

Word	Noun	Adjective	Verb	Adverb
snow goose	Yes	No	No	No
blue goose	Yes	No	No	No

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

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

Other hypernyms of snow goose include Chen caerulescens.

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