grey sea eagle vs European sea eagle

grey sea eagle and European sea eagle both are nouns.

Word	Noun	Adjective	Verb	Adverb
grey sea eagle	Yes	No	No	No
European sea eagle	Yes	No	No	No

As nouns, grey sea eagle and European sea eagle are synonyms defined as:

grey sea eagle and European sea eagle: bulky greyish-brown eagle with a short wedge-shaped white tail; of Europe and Greenland

Other synonyms of grey sea eagle include ern, erne, gray sea eagle, Haliatus albicilla, white-tailed sea eagle.

grey sea eagle (noun)	European sea eagle (noun)
bulky greyish-brown eagle with a short wedge-shaped white tail; of Europe and Greenland	bulky greyish-brown eagle with a short wedge-shaped white tail; of Europe and Greenland