brant goose vs goose

brant goose and goose both are nouns.

Word	Noun	Adjective	Verb	Adverb
brant goose	Yes	No	No	No
goose	Yes	No	Yes	No

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

brant goose: small dark geese that breed in the north and migrate southward
goose: web-footed long-necked typically gregarious migratory aquatic birds usually larger and less aquatic than ducks

brant goose (noun)	goose (noun)
small dark geese that breed in the north and migrate southward	web-footed long-necked typically gregarious migratory aquatic birds usually larger and less aquatic than ducks
	flesh of a goose (domestic or wild)
	a man who is a stupid incompetent fool