Solutions Dark prison cell has 5 entries with similar clues

• 8-letter words
• lockdownAct of confining prisoners to their cell
• 9-letter words
• negativesPhotographic films on which light is dark and dark is light
• oublietteAn underground prison cell
• 10-letter words
• panopticonA circular prison with cells arranged around a central well from which prisoners could at all times be observed
• 20-letter words
• solitary-confinementThe isolation of prisoner in a separate cell as a punishment