asylum (n.)

• bedlam
• bolt-hole
• cache
• clinic
• concealment
• corner
• cover
• covert
• cranny
• cubby
• cubbyhole
• den
• dugout
• farm
• foxhole
• harbor
• harborage
• haven
• hideaway
• hideout
• hiding
• hole
• home
• hospice
• hospital
• infirmary
• institution
• lair
• madhouse
• niche
• nook
• nuthouse
• orphanage
• poorhouse
• port
• preserve
• recess
• refuge
• retreat
• safehold
• sanatorium
• sanctuary
• security
• shelter
• sickbed
• sickroom
• stash
• stronghold
• ward
• workhouse