greylag goose vs Anser anser

greylag goose and Anser anser both are nouns.

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

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

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

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

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