lying-in vs childbed

lying-in and childbed both are nouns.

Word	Noun	Adjective	Verb	Adverb
lying-in	Yes	No	No	No
childbed	Yes	No	No	No

As nouns, lying-in and childbed are synonyms defined as:

lying-in and childbed: concluding state of pregnancy; from the onset of contractions to the birth of a child

Other synonyms of lying-in include confinement, labor, labour, parturiency, travail.

lying-in (noun)	childbed (noun)
concluding state of pregnancy; from the onset of contractions to the birth of a child	concluding state of pregnancy; from the onset of contractions to the birth of a child