A Thunder

The loud rumbling, cracking, or crashing sound caused by expansion of rapidly heated air around a lightning bolt.
A sound resembling thunder; especially, one produced by a jet airplane in flight.
A deep, rumbling noise.
An alarming or startling threat or denunciation.
(obsolete) The discharge of electricity; a thunderbolt.
(figuratively) The spotlight.

roll, clap, peal are some of the words used to count thunder e.g. A series of rolls/claps/peals of thunder were heard