Synonyms and related words :
abri, air-raid shelter, antre, approach trench, asylum, bolt-hole, bomb shelter, bombproof, bunker, burrow, cache, cave, cavern, communication trench, concealment, corner, countermine, coupure, cove, cover, covert, coverture, cranny, cubby, cubbyhole, cyclone cellar, dark corner, den, ditch, double sap, earth, entrenchment, fallout shelter, fire trench, flying sap, fortified tunnel, fosse, foxhole, funk hole, gallery, grot, grotto, hideaway, hideout, hidey hole, hiding, hiding place, hole, lair, mine, moat, niche, nook, parallel, recess, refuge, retreat, safety zone, sanctuary, sap, secret place, sewer, shelter, slit trench, stash, storm cave, storm cellar, subterrane, subway, trench, tunnel, undercovert, warren