Earless seal and Harp seal

Earless seal noun - Any of several seals lacking external ear flaps and having a stiff hairlike coat with hind limbs reduced to swimming flippers.

Harp seal and earless seal are semantically related. In some cases you can replace phrase "Harp seal" with "Earless seal", this phrases are similar.

Harp seal noun - Common Arctic seal; the young are all white.

Earless seal and harp seal are semantically related. You can use "Earless seal" instead a noun phrase "Harp seal".