custodial,
jail, secure, penal, residential
penitentiary,
top-security prison, penal complex, secure unit, pen (US, slang), detention
center, reformatory, pokey (US, dated slang), jail, slammer (slang), clink
(dated slang), young offenders' institution
confinement,
incarceration (formal), imprisonment, solitary confinement, detention,
custody