custody vs detention

custody and detention both are nouns.

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

As nouns, custody and detention are synonyms defined as:

custody and detention: a state of being confined (usually for a short time)

Other synonyms of custody include detainment, hold.

custody (noun)	detention (noun)
holding by the police	a punishment in which a student must stay at school after others have gone home
(with `in') guardianship over; in divorce cases it is the right to house and care for and discipline a child	a state of being confined (usually for a short time)
a state of being confined (usually for a short time)