gray sea eagle vs sea eagle

gray sea eagle and sea eagle both are nouns.

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

As nouns, sea eagle is a hypernym of gray sea eagle; that is, sea eagle is a word with a broader meaning than gray sea eagle:

gray sea eagle: bulky greyish-brown eagle with a short wedge-shaped white tail; of Europe and Greenland
sea eagle: any of various large eagles that usually feed on fish

gray sea eagle (noun)	sea eagle (noun)
bulky greyish-brown eagle with a short wedge-shaped white tail; of Europe and Greenland	any of various large eagles that usually feed on fish
	large harmless hawk found worldwide that feeds on fish and builds a bulky nest often occupied for years