A penal institution is a place of confinement for people who have been convicted of a crime. INCARCERATION (13 letters) is the act of confining someone in a prison or other form of detention. PENITENTIARY (12 letters) is a term used to describe a prison or correctional facility. PEN (3 letters) is a writing instrument used to apply ink to paper. SLAMMER (7 letters) is slang for a JAIL or prison. DUNGEON (7 letters) is a dark, often underground prison cell. CAN (3 letters) is a slang term for a JAIL or prison. LOCKUP (6 letters) is another term for a JAIL or prison. STOCKADE (8 letters) is a secure enclosure used to detain prisoners. BRIG (4 letters) is a military prison. JAIL (4 letters) is a place of temporary confinement for people accused or convicted of a crime.