tiger cub vs young carnivore

tiger cub and young carnivore both are nouns.

Word	Noun	Adjective	Verb	Adverb
tiger cub	Yes	No	No	No
young carnivore	Yes	No	No	No

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

tiger cub: a young tiger
young carnivore: the young of certain carnivorous mammals such as the bear or wolf or lion

Other hypernyms of tiger cub include cub, Panthera tigris, tiger.

tiger cub (noun)	young carnivore (noun)
a young tiger	the young of certain carnivorous mammals such as the bear or wolf or lion