POW camp Photronic cell adytum animal cell apartment ashram bastille bioplast black hole booth borstal borstal institution box bridewell brig bunch cabal cadre camarilla cavity cellular tissue cellule chamber charmed circle chromatoplasm circle clan clique cloister closed circle coenocyte compartment concentration camp condemned cell corpuscle coterie crew crib crowd crypt cubicle cytoplasm death cell death house death row den detention camp ectoplasm electron-image tube elite elite group enclosed space endoplasm energid eucaryotic cell federal prison forced-labor camp gaol gas phototube germ cell group guardhouse hermitage hideaway hideout hiding place hold hole hollow holy of holies house of correction house of detention industrial school ingroup inner circle internment camp ivory tower jail jailhouse junta junto keep labor camp lair lockup manger maximum-security prison mew minimum-security prison mob multiplier phototube oubliette outfit pen penal colony penal institution penal settlement penitentiary pew photoconductor cell photomultiplier tube phototube photovoltaic cell plant cell plasmodium prison prison camp prisonhouse privacy procaryotic cell protoplasm recess reform school reformatory reticulum retreat ring room sanctum sanctum sanctorum secret place set soft phototube somatic cell sponging house stall state prison stockade syncytium the hole tollbooth training school trophoplasm vacuum phototube vault we-group