childbirth vs vaginal birth

childbirth and vaginal birth both are nouns.

Word	Noun	Adjective	Verb	Adverb
childbirth	Yes	No	No	No
vaginal birth	Yes	No	No	No

As nouns, childbirth and vaginal birth are synonyms defined as:

childbirth and vaginal birth: the parturition process in human beings; having a baby; the process of giving birth to a child

Other synonyms of childbirth include accouchement, childbearing.

childbirth (noun)	vaginal birth (noun)
the parturition process in human beings; having a baby; the process of giving birth to a child	the parturition process in human beings; having a baby; the process of giving birth to a child