pinnatiped vs walrus

pinnatiped and walrus both are nouns.

Word	Noun	Adjective	Verb	Adverb
pinnatiped	Yes	No	No	No
walrus	Yes	No	No	No

As nouns, walrus is a hyponym of pinnatiped; that is, walrus is a word with a more specific, narrower meaning than pinnatiped:

pinnatiped: aquatic carnivorous mammal having a streamlined body specialized for swimming with limbs modified as flippers
walrus: either of two large northern marine mammals having ivory tusks and tough hide over thick blubber

Other hyponyms of pinnatiped include seal, sea horse, seahorse.

pinnatiped (noun)	walrus (noun)
aquatic carnivorous mammal having a streamlined body specialized for swimming with limbs modified as flippers	either of two large northern marine mammals having ivory tusks and tough hide over thick blubber