Anser anser vs greylag goose

Anser anser and greylag goose both are nouns.

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

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

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

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

Anser anser (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