The difference between Earless seal and Pinniped
When used as nouns, earless seal means any of the seals in the taxonomic family phocidae characterized by lacking external ear flaps, whereas pinniped means any of various large marine mammals belonging to the superfamily (formerly considered a suborder) pinnipedia comprising walruses, eared seals and earless seals.
Pinniped is also adjective with the meaning: pertaining to or similar to such a mammal.
check bellow for the other definitions of Earless seal and Pinniped
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Earless seal as a noun:
Any of the seals in the taxonomic family Phocidae characterized by lacking external ear flaps; true seals.
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Pinniped as a noun:
Any of various large marine mammals belonging to the superfamily (formerly considered a suborder) Pinnipedia comprising walruses, eared seals and earless seals.
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Pinniped as an adjective:
Pertaining to or similar to such a mammal.