Ornithorhynchus vs mammal genus

Ornithorhynchus and mammal genus both are nouns.

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

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

Ornithorhynchus (noun)	mammal genus (noun)
type genus of the family Ornithorhynchidae	a genus of mammals