cub vs birth

cub and birth both are nouns.

Word	Noun	Adjective	Verb	Adverb
cub	Yes	No	Yes	No
birth	Yes	No	Yes	No

As verbs, birth is a hypernym of cub; that is, birth is a word with a broader meaning than cub:

Other hypernyms of cub include bear, deliver, give birth, have.

cub (noun)	birth (noun)
the young of certain carnivorous mammals such as the bear or wolf or lion	the event of being born
a male child (a familiar term of address to a boy)	a baby born; an offspring
an awkward and inexperienced youth	the process of giving birth
	the kinship relation of an offspring to the parents
	the time when something begins (especially life)

cub (verb)	birth (verb)
give birth to cubs	cause to be born