lying-in vs parturiency

lying-in and parturiency both are nouns.

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

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

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

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

lying-in (noun)	parturiency (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