lying-in vs confinement

lying-in and confinement both are nouns.

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

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

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

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

lying-in (noun)	confinement (noun)
concluding state of pregnancy; from the onset of contractions to the birth of a child	the act of restraining of a person's liberty by confining them
	the act of keeping something within specified bounds (by force if necessary)
	the state of being confined
	concluding state of pregnancy; from the onset of contractions to the birth of a child