true seal vs hair seal

true seal and hair seal both are nouns.

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

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

true seal and hair 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 true seal include earless seal.

true seal (noun)	hair 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