birth vs live birth

birth and live birth both are nouns.

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

As nouns, live birth is a hyponym of birth; that is, live birth is a word with a more specific, narrower meaning than birth:

birth: the event of being born
live birth: the birth of a living fetus (regardless of the length of gestation)

Other hyponyms of birth include delivery, posthumous birth, posthumous birth, rebirth, reincarnation, renascence.

birth (noun)	live birth (noun)
the event of being born	the birth of a living fetus (regardless of the length of gestation)
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)

birth (verb)	live birth (verb)
cause to be born