Odobenus divergens vs sea horse

Odobenus divergens and sea horse both are nouns.

Word	Noun	Adjective	Verb	Adverb
Odobenus divergens	Yes	No	No	No
sea horse	Yes	No	No	No

As nouns, sea horse is a hypernym of Odobenus divergens; that is, sea horse is a word with a broader meaning than Odobenus divergens:

Odobenus divergens: a walrus of the Bering Sea and northern Pacific
sea horse: either of two large northern marine mammals having ivory tusks and tough hide over thick blubber

Other hypernyms of Odobenus divergens include seahorse, walrus.

Odobenus divergens (noun)	sea horse (noun)
a walrus of the Bering Sea and northern Pacific	small fish with horse-like heads bent sharply downward and curled tails; swim in upright position
	either of two large northern marine mammals having ivory tusks and tough hide over thick blubber