greylag vs greylag goose

greylag and greylag goose both are nouns.

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

As nouns, greylag and greylag goose are synonyms defined as:

greylag and greylag goose: common grey wild goose of Europe; ancestor of many domestic breeds

Other synonyms of greylag include Anser anser, graylag, graylag goose.

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