blessed event vs live birth

blessed event and live birth both are nouns.

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

As nouns, live birth is a hypernym of blessed event; that is, live birth is a word with a broader meaning than blessed event:

blessed event: the live birth of a child
live birth: the birth of a living fetus (regardless of the length of gestation)

blessed event (noun)	live birth (noun)
the live birth of a child	the birth of a living fetus (regardless of the length of gestation)