goose vs Anser anser

goose and Anser anser both are nouns.

Word	Noun	Adjective	Verb	Adverb
goose	Yes	No	Yes	No
Anser anser	Yes	No	No	No

As nouns, Anser anser is a hyponym of goose; that is, Anser anser 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
Anser anser: common grey wild goose of Europe; ancestor of many domestic breeds

goose (noun)	Anser anser (noun)
web-footed long-necked typically gregarious migratory aquatic birds usually larger and less aquatic than ducks	common grey wild goose of Europe; ancestor of many domestic breeds
flesh of a goose (domestic or wild)
a man who is a stupid incompetent fool