Zalophus vs mammal genus

Zalophus and mammal genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Zalophus	Yes	No	No	No
mammal genus	Yes	No	No	No

As nouns, mammal genus is a hypernym of Zalophus; that is, mammal genus is a word with a broader meaning than Zalophus:

Zalophus (noun)	mammal genus (noun)
a genus of sea lions and fur seals (Zalophus)	a genus of mammals