grey sea eagle vs gray sea eagle

grey sea eagle and gray sea eagle both are nouns.

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

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

grey sea eagle and gray 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, European sea eagle, Haliatus albicilla, white-tailed sea eagle.

grey sea eagle (noun)	gray 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