young carnivore vs young mammal

young carnivore and young mammal both are nouns.

Word	Noun	Adjective	Verb	Adverb
young carnivore	Yes	No	No	No
young mammal	Yes	No	No	No

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

young carnivore: the young of certain carnivorous mammals such as the bear or wolf or lion
young mammal: any immature mammal

young carnivore (noun)	young mammal (noun)
the young of certain carnivorous mammals such as the bear or wolf or lion	any immature mammal