noun
On'yomi reading used mainly in compounds (e.g., 雷雨, 雷鳴) or formal/literary contexts. The kun'yomi かみなり is the everyday word for thunder and lightning.
See also: 雷 (かみなり)
雷雨のため試合は中止になった。
The match was canceled due to a thunderstorm.
遠くで雷鳴が聞こえた。
I heard thunder rumbling in the distance.