walrus vs pinnatiped

walrus and pinnatiped both are nouns.

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

As nouns, pinnatiped is a hypernym of walrus; that is, pinnatiped is a word with a broader meaning than walrus:

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

Other hypernyms of walrus include pinniped, pinniped mammal.

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