lag screw(n = noun.artifact) lag bolt - a heavy woodscrew with a square or hexagonal head that is driven in with a wrench;
is a kind of woodscrew
allen screw, bed screw, binding screw, bottle screw, breech screw, cap screw, hindleys screw, jet lag, lag, lag b'omer, lag behind, lag bolt, machine screw, metal screw, nut-leaved screw tree, phillips screw, screw, screw auger, screw augur, screw bean, screw eye, screw jack, screw key, screw log, screw pine, screw propeller, screw thread, screw tree, screw up, screw wrench, temper screw, textile screw pine, time lag, tractor screw, water screw, wing screw