custody vs confinement

custody and confinement both are nouns.

Word	Noun	Adjective	Verb	Adverb
custody	Yes	No	No	No
confinement	Yes	No	No	No

As nouns, confinement is a hypernym of custody; that is, confinement is a word with a broader meaning than custody:

custody (noun)	confinement (noun)
holding by the police	the act of restraining of a person's liberty by confining them
(with `in') guardianship over; in divorce cases it is the right to house and care for and discipline a child	the act of keeping something within specified bounds (by force if necessary)
a state of being confined (usually for a short time)	the state of being confined
	concluding state of pregnancy; from the onset of contractions to the birth of a child