eared seal vs fur seal

eared seal and fur seal both are nouns.

Word	Noun	Adjective	Verb	Adverb
eared seal	Yes	No	No	No
fur seal	Yes	No	No	No

As nouns, fur seal is a hyponym of eared seal; that is, fur seal is a word with a more specific, narrower meaning than eared seal:

eared seal: pinniped mammal having external ear flaps and hind limbs used for locomotion on land; valued for its soft underfur
fur seal: eared seal of the Southern Hemisphere; the thick soft underfur is the source of sealskin

Other hyponyms of eared seal include sea lion.

eared seal (noun)	fur seal (noun)
pinniped mammal having external ear flaps and hind limbs used for locomotion on land; valued for its soft underfur	eared seal of the Southern Hemisphere; the thick soft underfur is the source of sealskin
	an eared seal of the northern Pacific