Thunderstorm - a local storm produced by a cumulonimbus cloud, always with lightning and thunder, and usually accompanied by strong gusts of wind, heavy rain, and sometimes hail.  See related term below:

Thunder - the sound that follows a flash of lightning and is caused by sudden expansion of the air in the path of the electrical discharge

Storm - a disturbance of the atmosphere marked by wind and usually by rain, snow, hail, sleet, or thunder and lightning

Lightning - any visible electrical discharge produced by thunderstorms

Cumulonimbus - exceptionally dense and vertically developed cloud type, occurring both as isolated clouds and as a line or wall of clouds, and generally accompanied by heavy rain, lightning, and thunder

Cumulus - cloud type in the form of individual, detached elements which are generally dense, have well-defined outlines, show vertical development in the form of domes, mounds, or towers

Cloud - a visible mass of minute water and/or ice particles in the atmosphere suspended above the earth's surface