Changes

A nuclear bomb is a bomb with a nuclear component, that causes radiation fallout when it explodes.

A nuclear bomb is a bomb with a nuclear component, that causes an uncontrolled fission reaction releasing massive amounts of thermal and radioactive energy.  Nulear weapons come are capable of massive destruction due to the combined effects of the thermal radiation and blast wave created by the detonation.  Radiation is actually a by-product of the weapon, not the primary destrutive force.