hair seal vs true seal

hair seal and true seal both are nouns.

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

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

hair seal and true 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 earless seal.

hair seal (noun)	true 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