built in bed(n = noun.artifact) berth, bunk - a bed on a ship or train; usually in tiers;
is a kind of bed
has particulars: lower, lower berth, upper, upper berth

air bed, air built, alveolar bed, asparagus bed, baby bed, baby's bed, bacteria bed, bed, bed and breakfast, bed bug, bed check, bed clothing, bed cover, bed covering, bed down, bed ground, bed jacket, bed linen, bed of flowers, bed of roses, bed pillow, bed rest, bed rock, bed screw, bed sheet, bed steps, bed wetter, built, built-in bed, bunk bed, camp bed, capillary bed, creek bed, day bed, divan bed, double bed, feather bed, filter bed, flower bed, go to bed, hospital bed, jerry built, lake bed, marital bed, marriage bed, murphy bed, ore bed, oyster bed, pig bed, platform bed, procrustean bed, railroad bed, rose bed, single bed, sleigh bed, sofa bed, test bed, truck bed, truckle bed, trundle bed, tulip bed, turnip bed, twin bed, water bed