Synonyms and related words :
adytum, ashram, asylum, bolt-hole, cache, cell, cloister, concealment, corner, cover, covert, coverture, cranny, cubby, cubbyhole, dark corner, den, dugout, foxhole, funk hole, hermitage, hideout, hidey hole, hiding, hiding place, hole, holy of holies, ivory tower, lair, mew, niche, nook, privacy, recess, refuge, retreat, safe haven, sanctuary, sanctum, sanctum sanctorum, secret place, stash, undercovert