greylag vs goose

greylag and goose both are nouns.

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

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

greylag: 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 (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