Delphinus vs mammal genus

Delphinus and mammal genus both are nouns.

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

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

Delphinus (noun)	mammal genus (noun)
type genus of the Delphinidae	a genus of mammals
a constellation in the Northern Hemisphere near Pegasus and Aquila