greylag goose vs goose

greylag goose and goose both are nouns.

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

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

greylag goose: common grey wild goose of Europe; ancestor of many domestic breeds
goose: web-footed long-necked typically gregarious migratory aquatic birds usually larger and less aquatic than ducks

greylag goose (noun)	goose (noun)
common grey wild goose of Europe; ancestor of many domestic breeds	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