have young vs birth

have young is not a noun while birth is a noun.

Word	Noun	Adjective	Verb	Adverb
have young	No	No	Yes	No
birth	Yes	No	Yes	No

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

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

have young (noun)	birth (noun)
	the event of being born
	a baby born; an offspring
	the process of giving birth
	the kinship relation of an offspring to the parents
	the time when something begins (especially life)

have young (verb)	birth (verb)
give birth to (a calf)	cause to be born