European sea eagle vs grey sea eagle

European sea eagle and grey sea eagle both are nouns.

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

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

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

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

European sea eagle (noun)	grey 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