sanctum /sangkˈtəm/

1. (esp in the phrase inner sanctum) a sacred place
2. A (very) private room

sanctum sanctorum noun

1. The holy of holies, the inner chamber of the Jewish tabernacle
2. Any specially reserved retreat or room (informal)

• Rupert's drops
• rupestrian
• rupia
• rupiah
• rupiahs
• rupias
• rupicoline
• serrates
• serrati
• serrating
• serration
• serrations
• serratirostral
• serratulate
• serrature
• serratures
• serratus
• serratuses
• serre
• serred
• serrefile
• serrefiles
• serres
• serricorn
• serried