seahorse vs genus Odobenus

seahorse and genus Odobenus both are nouns.

Word	Noun	Adjective	Verb	Adverb
seahorse	Yes	No	No	No
genus Odobenus	Yes	No	No	No

seahorse (noun)	genus Odobenus (noun)
small fish with horse-like heads bent sharply downward and curled tails; swim in upright position	type genus of the Odobenidae: walruses
either of two large northern marine mammals having ivory tusks and tough hide over thick blubber