gray sea eagle vs grey sea eagle

gray sea eagle and grey sea eagle both are nouns.

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

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

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

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

gray 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