parturiency vs lying-in

parturiency and lying-in both are nouns.

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

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

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

Other synonyms of parturiency include childbed, confinement, labor, labour, travail.

parturiency (noun)	lying-in (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