hair seal vs earless seal

hair seal and earless seal both are nouns.

Word	Noun	Adjective	Verb	Adverb
hair seal	Yes	No	No	No
earless seal	Yes	No	No	No

As nouns, hair seal and earless seal are synonyms defined as:

hair seal and earless seal: any of several seals lacking external ear flaps and having a stiff hairlike coat with hind limbs reduced to swimming flippers

Other synonyms of hair seal include true seal.

hair seal (noun)	earless seal (noun)
any of several seals lacking external ear flaps and having a stiff hairlike coat with hind limbs reduced to swimming flippers	any of several seals lacking external ear flaps and having a stiff hairlike coat with hind limbs reduced to swimming flippers