goose vs brent goose

goose and brent goose both are nouns.

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

As nouns, brent goose is a hyponym of goose; that is, brent goose is a word with a more specific, narrower meaning than goose:

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

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