kitten vs birth

kitten and birth both are nouns.

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

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

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

kitten (noun)	birth (noun)
young domestic cat	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)

kitten (verb)	birth (verb)
give birth to kittens	cause to be born